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Derivatives - Derivatives Designated as Accounting Hedges - Cash Flow Hedges (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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| In Text Details [Abstract] | ||||||||||
| Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 1,200,000,000 | |||||||||
| Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Net of Tax | (750,000,000) | |||||||||
| Loss, Net Investment Hedge Related to Foreign Exchange Risk Excluded From Accumulated Other Comprehensive Income | 145,000,000 | 7,000,000 | (33,000,000) | |||||||
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Cash Flow Hedging [Member]
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| Cash Flow Hedges And Net Investment Hedges [Abstract] | ||||||||||
| Gain (losses) Recognized in Accumulated OCI on Derivatives | 86,000,000 | (1,749,000,000) | 124,000,000 | (2,671,000,000) | ||||||
| Gains (losses) in Income Reclassified from Accumulated OCI | (285,000,000) | (537,000,000) | (725,000,000) | (1,352,000,000) | ||||||
| Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing | 28,000,000 | [1] | (8,000,000) | [1] | ||||||
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Interest Rate Risk on Variable Rate Portfolios [Member] | Cash Flow Hedging [Member]
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| Cash Flow Hedges And Net Investment Hedges [Abstract] | ||||||||||
| Gain (losses) Recognized in Accumulated OCI on Derivatives | 21,000,000 | (1,550,000,000) | (32,000,000) | (2,272,000,000) | ||||||
| Gains (losses) in Income Reclassified from Accumulated OCI | (260,000,000) | (464,000,000) | (636,000,000) | (1,212,000,000) | ||||||
| Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing | 26,000,000 | [1] | (8,000,000) | [1] | ||||||
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Commodity price risk on commodity inventory [Member] | Cash Flow Hedging [Member]
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| Cash Flow Hedges And Net Investment Hedges [Abstract] | ||||||||||
| Gain (losses) Recognized in Accumulated OCI on Derivatives | 5,000,000 | (4,000,000) | ||||||||
| Gains (losses) in Income Reclassified from Accumulated OCI | 3,000,000 | 2,000,000 | 5,000,000 | |||||||
| Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing | 2,000,000 | [1] | ||||||||
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Price risk on restricted stock awards [Member] | Cash Flow Hedging [Member]
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| Cash Flow Hedges And Net Investment Hedges [Abstract] | ||||||||||
| Gain (losses) Recognized in Accumulated OCI on Derivatives | 65,000,000 | (204,000,000) | 156,000,000 | (395,000,000) | ||||||
| Gains (losses) in Income Reclassified from Accumulated OCI | (28,000,000) | (75,000,000) | (89,000,000) | (145,000,000) | ||||||
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Foreign Exchange Risk [Member] | Net Investment Hedging [Member]
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| Cash Flow Hedges And Net Investment Hedges [Abstract] | ||||||||||
| Gain (losses) Recognized in Accumulated OCI on Derivatives | (1,149,000,000) | 2,212,000,000 | (1,021,000,000) | 597,000,000 | ||||||
| Gains (losses) in Income Reclassified from Accumulated OCI | 11,000,000 | (16,000,000) | (26,000,000) | 407,000,000 | ||||||
| Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing | $ (13,000,000) | [1] | $ (175,000,000) | [1] | $ (180,000,000) | [1] | $ (425,000,000) | [1] | ||
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