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Derivatives Derivatives - Valuation Adjustments (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Mar. 31, 2013
Change in Calculation Methodology [Member]
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Jun. 30, 2013
Change in Calculation Methodology [Member]
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| Derivative [Line Items] | |||||||||||||||
| Net Debit Valuation Adjustment (Gain) Loss, Excluding Impact of Change in Calculation Methodology | $ (3,000,000) | ||||||||||||||
| Net Credit Valuation Adjustment Gain (Loss), Excluding Impact of Change in Calculation Methodology | 195,000,000 | ||||||||||||||
| Credit Valuation Gains Losses Net Of Hedges Recognized In Trading Account Profits For Counterparty Credit Risk | 91,000,000 | [1] | (52,000,000) | [1] | (11,000,000) | [1] | 173,000,000 | [1] | |||||||
| Credit Valuation Gain (Loss) Recognized In Trading Account Profit (Loss) Related to Changes in the Entity Credit Quality | 101,000,000 | [2] | 19,000,000 | [2] | 225,000,000 | [2] | (606,000,000) | [2] | |||||||
| Credit Valuation Gains (Losses) For Counterparty Credit Risk Related To Derivative Assets | 53,000,000 | [1] | (100,000,000) | [1] | (23,000,000) | [1] | 149,000,000 | [1] | |||||||
| Credit Valuation Gain (Loss) Recognized In Trading Account Profit (Loss) Related to Changes in the Entity Credit Quality | 206,000,000 | ||||||||||||||
| Derivative Credit Risk Valuation Adjustment, Derivative Assets | 1,200,000,000 | 1,200,000,000 | 1,100,000,000 | ||||||||||||
| Derivative Credit Risk Valuation Adjustment, Derivative Liabilities | 600,000,000 | 600,000,000 | 400,000,000 | ||||||||||||
| Credit Valuation Gains (Losses) Net of Hedges Recognized In Trading Account Profit (Loss) | $ 80,000,000 | [2] | $ (73,000,000) | [2] | $ 209,000,000 | [2] | $ (770,000,000) | [2] | |||||||
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