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Risk Management Activities and Fair Value Measurements - Gains and Losses on Qualifying and Non-Qualifying Financial Instruments used in Hedging Transactions (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Jun. 30, 2011
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Derivatives in Cash Flow Hedging Relationships
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| Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | $ 31 | $ 50 | |||||||||||||||
| Amount of Gain (Loss) Reclassified from AOCI into Income | 19 | [1] | (13) | [1] | (23) | [1] | (46) | [1] | |||||||||
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Derivatives in Cash Flow Hedging Relationships | Interest Rate
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| Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | 13 | 15 | |||||||||||||||
| Amount of Gain (Loss) Reclassified from AOCI into Income | 1 | [1] | 2 | [1] | 3 | [1] | 4 | [1] | |||||||||
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Derivatives in Cash Flow Hedging Relationships | Foreign currency hedges
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| Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | 17 | 32 | |||||||||||||||
| Amount of Gain (Loss) Reclassified from AOCI into Income | 18 | [1] | (19) | [1] | (27) | [1] | (68) | [1] | |||||||||
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Derivatives in Cash Flow Hedging Relationships | Commodities
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| Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | 1 | 3 | |||||||||||||||
| Amount of Gain (Loss) Reclassified from AOCI into Income | 0 | [1] | 4 | [1] | 1 | [1] | 18 | [1] | |||||||||
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Derivatives in Net Investment Hedging Relationships
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| Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | (37) | (88) | |||||||||||||||
| Amount of Gain (Loss) Recognized in Income | (5) | [2] | (1) | [2] | (8) | [2] | (1) | [2] | |||||||||
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Derivatives in Fair Value Hedging Relationships
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| Amount of Gain (Loss) Recognized in Income | 0 | [2] | 2 | [2] | (2) | [2] | 1 | [2] | |||||||||
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Derivatives in Fair Value Hedging Relationships | Interest Rate
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| Amount of Gain (Loss) Recognized in Income | (19) | [2] | (87) | [2] | 112 | [2] | (25) | [2] | |||||||||
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Derivatives in Fair Value Hedging Relationships | Debt
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| Amount of Gain (Loss) Recognized in Income | 19 | [2] | 89 | [2] | (114) | [2] | 26 | [2] | |||||||||
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Derivatives Not Designated as Hedging Instruments
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| Amount of Gain (Loss) Recognized in Income | (410) | [3] | (108) | [3] | (992) | [3] | 630 | [3] | |||||||||
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Derivatives Not Designated as Hedging Instruments | Foreign currency hedges
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| Amount of Gain (Loss) Recognized in Income | (410) | [3],[4] | (110) | [3],[4] | (991) | [3],[4] | 626 | [3],[4] | |||||||||
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Derivatives Not Designated as Hedging Instruments | Commodities
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| Amount of Gain (Loss) Recognized in Income | $ 0 | [3] | $ 2 | [3] | $ (1) | [3] | $ 4 | [3] | |||||||||
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