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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Gain (Loss) on Derivative Instruments, Net, Pretax $ 9 $ (160) $ (64) $ (178) Ìý
Cash and Cash Equivalents, Fair Value Disclosure 1,087 Ìý 1,087 Ìý Ìý
Short term marketable securities 508 Ìý 508 Ìý 186
Available-for-sale securities 1,361 Ìý 1,361 Ìý Ìý
Debt 1,879 Ìý 1,879 Ìý Ìý
Quoted Prices In Active Markets For Identical Assets (Level 1)
Ìý Ìý Ìý Ìý Ìý
Cash and Cash Equivalents, Fair Value Disclosure 1,053 Ìý 1,053 Ìý Ìý
Short term marketable securities 0 Ìý 0 Ìý Ìý
Available-for-sale securities 869 Ìý 869 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 34 Ìý 34 Ìý Ìý
Short term marketable securities 508 Ìý 508 Ìý Ìý
Available-for-sale securities 492 Ìý 492 Ìý Ìý
Debt 1,879 Ìý 1,879 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 $ 112 $ 41 $ 336 $ 181 Ìý