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Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)

v2.4.0.8
Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Gain (Loss) on Derivative Instruments, Net, Pretax $ 15 $ (160) $ (49) $ (338) Ìý
Cash and Cash Equivalents, Fair Value Disclosure 600 Ìý 600 Ìý Ìý
Short term marketable securities 552 Ìý 552 Ìý 186
Available-for-sale securities 1,339 Ìý 1,339 Ìý Ìý
Debt 2,236 Ìý 2,236 Ìý Ìý
Quoted Prices In Active Markets For Identical Assets (Level 1)
Ìý Ìý Ìý Ìý Ìý
Cash and Cash Equivalents, Fair Value Disclosure 600 Ìý 600 Ìý Ìý
Short term marketable securities 0 Ìý 0 Ìý Ìý
Available-for-sale securities 899 Ìý 899 Ìý Ìý
Debt 0 Ìý 0 Ìý Ìý
Significant Other Observable Inputs (Level 2)
Ìý Ìý Ìý Ìý Ìý
Cash and Cash Equivalents, Fair Value Disclosure 0 Ìý 0 Ìý Ìý
Short term marketable securities 552 Ìý 552 Ìý Ìý
Available-for-sale securities 440 Ìý 440 Ìý Ìý
Debt 2,236 Ìý 2,236 Ìý Ìý
Fair Value, Inputs, Level 3 [Member]
Ìý Ìý Ìý Ìý Ìý
Cash and Cash Equivalents, Fair Value Disclosure 0 Ìý 0 Ìý Ìý
Short term marketable securities 0 Ìý 0 Ìý Ìý
Available-for-sale securities 0 Ìý 0 Ìý Ìý
Debt 0 Ìý 0 Ìý Ìý
Fair Value Opition Securities [Member]
Ìý Ìý Ìý Ìý Ìý
Gain (Loss) on Derivative Instruments, Net, Pretax $ 31 $ 237 $ 367 $ 418 Ìý