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Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Narrative) (Details)

v3.20.4
Stockholders' Equity (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Vote
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
May 23, 2018
shares
Mar. 09, 2018
Jun. 02, 2015
shares
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Capital stock authorized for issuance Ìý Ìý Ìý 8,200,000,000 Ìý 9,015,000,000
Common Stock, Capital Shares Reserved for Future Issuance 43,800,000 Ìý Ìý 8,150,000,000 Ìý 8,965,000,000
Preferred Stock, Capital Shares Reserved for Future Issuance Ìý Ìý Ìý 50,000,000 Ìý Ìý
Common Class A Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Number of votes | Vote 1 Ìý Ìý Ìý Ìý Ìý
Share received in exchange 1 Ìý Ìý Ìý Ìý Ìý
Common stock, shares authorized 4,000,000,000 4,000,000,000 Ìý Ìý Ìý Ìý
Common Stock, Shares, Issued 382,165,550 386,691,461 Ìý Ìý Ìý Ìý
Common Stock, Shares, Outstanding 382,165,550 386,691,461 Ìý Ìý Ìý Ìý
Common Stock, Capital Shares Reserved for Future Issuance Ìý Ìý Ìý 4,000,000,000 Ìý Ìý
Stock Repurchased and Retired During Period, Shares 6,521,782 24,329,610 43,080,787 Ìý Ìý Ìý
Stock Repurchased and Retired During Period, Value | $ $ 70.0 $ 392.0 $ 988.0 Ìý Ìý Ìý
Common Class A | Stock Option Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Common Stock, Capital Shares Reserved for Future Issuance 40,600,000 Ìý Ìý Ìý Ìý Ìý
Common Class A | Liberty Ventures common stock Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Spilt-Off redemption ratio Ìý Ìý Ìý Ìý 1 Ìý
Common Stock, Capital Shares Reserved for Future Issuance Ìý Ìý Ìý Ìý Ìý 400,000,000
Common Class B Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Number of votes | Vote 10 Ìý Ìý Ìý Ìý Ìý
Common stock, shares authorized 150,000,000 150,000,000 Ìý Ìý Ìý Ìý
Common Stock, Shares, Issued 29,366,492 29,278,424 Ìý Ìý Ìý Ìý
Common Stock, Shares, Outstanding 29,366,492 29,278,424 Ìý Ìý Ìý Ìý
Common Stock, Capital Shares Reserved for Future Issuance Ìý Ìý Ìý 150,000,000 Ìý Ìý
Common Class B | Stock Option Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Common Stock, Capital Shares Reserved for Future Issuance 3,200,000 Ìý Ìý Ìý Ìý Ìý
Common Class B | Liberty Ventures common stock Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Spilt-Off redemption ratio Ìý Ìý Ìý Ìý 1 Ìý
Common Stock, Capital Shares Reserved for Future Issuance Ìý Ìý Ìý Ìý Ìý 15,000,000
Common Class C Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Common stock, shares authorized 4,000,000,000 Ìý Ìý Ìý Ìý Ìý
Common Stock, Shares, Issued 0 Ìý Ìý Ìý Ìý Ìý
Common Stock, Shares, Outstanding 0 Ìý Ìý Ìý Ìý Ìý
Common Stock, Capital Shares Reserved for Future Issuance Ìý Ìý Ìý 4,000,000,000 Ìý Ìý
Common Class C | Liberty Ventures common stock Ìý Ìý Ìý Ìý Ìý Ìý
Class of Stock [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Common Stock, Capital Shares Reserved for Future Issuance Ìý Ìý Ìý Ìý Ìý 400,000,000