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Derivatives - Credit Derivatives (Details) (USD $)
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Jun. 30, 2014
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Dec. 31, 2013
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| Carrying Value [Abstract] | ||||||||
| Gross Derivative Liabilities | $ 793,300,000,000 | $ 906,400,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 292,331,000,000 | 273,635,000,000 | ||||||
| One to Three Years | 491,449,000,000 | 478,409,000,000 | ||||||
| Three to Five Years | 459,218,000,000 | 510,848,000,000 | ||||||
| Over Five Years | 59,650,000,000 | 65,895,000,000 | ||||||
| Notional Amount of Derivatives | 1,302,648,000,000 | 1,328,787,000,000 | ||||||
| In Text Details [Abstract] | ||||||||
| Carrying value of written credit derivatives | 3,100,000,000 | 8,100,000,000 | ||||||
| Notional Amount of Written Credit Derivatives With Identical Referenced Underlying Held by Entity | 950,500,000,000 | 1,000,000,000,000 | ||||||
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Credit Derivative [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 853,000,000 | 477,000,000 | ||||||
| One to Three Years | 1,600,000,000 | 2,182,000,000 | ||||||
| Three to Five Years | 1,716,000,000 | 3,445,000,000 | ||||||
| Over Five Years | 5,037,000,000 | 7,887,000,000 | ||||||
| Gross Derivative Liabilities | 9,206,000,000 | 13,991,000,000 | ||||||
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Credit Default Swap [Member] | Credit Risk Contract [Member] | Credit Default Swap, Selling Protection [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 429,000,000 | 426,000,000 | ||||||
| One to Three Years | 1,514,000,000 | 2,144,000,000 | ||||||
| Three to Five Years | 1,714,000,000 | 3,443,000,000 | ||||||
| Over Five Years | 5,034,000,000 | 7,801,000,000 | ||||||
| Gross Derivative Liabilities | 8,691,000,000 | 13,814,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 228,207,000,000 | 224,080,000,000 | ||||||
| One to Three Years | 481,232,000,000 | 470,259,000,000 | ||||||
| Three to Five Years | 455,828,000,000 | 506,745,000,000 | ||||||
| Over Five Years | 58,573,000,000 | 64,296,000,000 | ||||||
| Notional Amount of Derivatives | 1,223,840,000,000 | [1] | 1,265,380,000,000 | [1] | ||||
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Return Swaps Other [Member] | Credit Risk Contract [Member] | Credit Default Swap, Selling Protection [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 424,000,000 | 51,000,000 | ||||||
| One to Three Years | 86,000,000 | 38,000,000 | ||||||
| Three to Five Years | 2,000,000 | 2,000,000 | ||||||
| Over Five Years | 3,000,000 | 86,000,000 | ||||||
| Gross Derivative Liabilities | 515,000,000 | 177,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 64,124,000,000 | 49,555,000,000 | ||||||
| One to Three Years | 10,217,000,000 | 8,150,000,000 | ||||||
| Three to Five Years | 3,390,000,000 | 4,103,000,000 | ||||||
| Over Five Years | 1,077,000,000 | 1,599,000,000 | ||||||
| Notional Amount of Derivatives | 78,808,000,000 | [1] | 63,407,000,000 | [1] | ||||
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Credit-related notes [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 65,000,000 | [2] | 145,000,000 | [2] | ||||
| One to Three Years | 461,000,000 | [2] | 385,000,000 | [2] | ||||
| Three to Five Years | 1,187,000,000 | [2] | 1,351,000,000 | [2] | ||||
| Over Five Years | 4,476,000,000 | [2] | 5,403,000,000 | [2] | ||||
| Gross Derivative Liabilities | 6,189,000,000 | [2] | 7,284,000,000 | [2] | ||||
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External Credit Rating, Investment Grade [Member] | Credit Default Swap [Member] | Credit Risk Contract [Member] | Credit Default Swap, Selling Protection [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 4,000,000 | 2,000,000 | ||||||
| One to Three Years | 213,000,000 | 220,000,000 | ||||||
| Three to Five Years | 349,000,000 | 974,000,000 | ||||||
| Over Five Years | 511,000,000 | 1,134,000,000 | ||||||
| Gross Derivative Liabilities | 1,077,000,000 | 2,330,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 178,882,000,000 | 170,764,000,000 | ||||||
| One to Three Years | 387,781,000,000 | 379,273,000,000 | ||||||
| Three to Five Years | 371,352,000,000 | 411,426,000,000 | ||||||
| Over Five Years | 35,155,000,000 | 36,039,000,000 | ||||||
| Notional Amount of Derivatives | 973,170,000,000 | 997,502,000,000 | ||||||
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External Credit Rating, Investment Grade [Member] | Return Swaps Other [Member] | Credit Risk Contract [Member] | Credit Default Swap, Selling Protection [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 45,000,000 | 22,000,000 | ||||||
| One to Three Years | ||||||||
| Three to Five Years | ||||||||
| Over Five Years | ||||||||
| Gross Derivative Liabilities | 45,000,000 | 22,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 37,417,000,000 | 21,771,000,000 | ||||||
| One to Three Years | ||||||||
| Three to Five Years | ||||||||
| Over Five Years | ||||||||
| Notional Amount of Derivatives | 37,417,000,000 | 21,771,000,000 | ||||||
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External Credit Rating, Investment Grade [Member] | Credit-related notes [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 2,000,000 | [2] | [2] | |||||
| One to Three Years | 291,000,000 | [2] | 278,000,000 | [2] | ||||
| Three to Five Years | 1,087,000,000 | [2] | 595,000,000 | [2] | ||||
| Over Five Years | 3,354,000,000 | [2] | 4,457,000,000 | [2] | ||||
| Gross Derivative Liabilities | 4,734,000,000 | [2] | 5,330,000,000 | [2] | ||||
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External Credit Rating, Non Investment Grade [Member] | Credit Default Swap [Member] | Credit Risk Contract [Member] | Credit Default Swap, Selling Protection [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 425,000,000 | 424,000,000 | ||||||
| One to Three Years | 1,301,000,000 | 1,924,000,000 | ||||||
| Three to Five Years | 1,365,000,000 | 2,469,000,000 | ||||||
| Over Five Years | 4,523,000,000 | 6,667,000,000 | ||||||
| Gross Derivative Liabilities | 7,614,000,000 | 11,484,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 49,325,000,000 | 53,316,000,000 | ||||||
| One to Three Years | 93,451,000,000 | 90,986,000,000 | ||||||
| Three to Five Years | 84,476,000,000 | 95,319,000,000 | ||||||
| Over Five Years | 23,418,000,000 | 28,257,000,000 | ||||||
| Notional Amount of Derivatives | 250,670,000,000 | 267,878,000,000 | ||||||
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External Credit Rating, Non Investment Grade [Member] | Return Swaps Other [Member] | Credit Risk Contract [Member] | Credit Default Swap, Selling Protection [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 379,000,000 | 29,000,000 | ||||||
| One to Three Years | 86,000,000 | 38,000,000 | ||||||
| Three to Five Years | 2,000,000 | 2,000,000 | ||||||
| Over Five Years | 3,000,000 | 86,000,000 | ||||||
| Gross Derivative Liabilities | 470,000,000 | 155,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 26,707,000,000 | 27,784,000,000 | ||||||
| One to Three Years | 10,217,000,000 | 8,150,000,000 | ||||||
| Three to Five Years | 3,390,000,000 | 4,103,000,000 | ||||||
| Over Five Years | 1,077,000,000 | 1,599,000,000 | ||||||
| Notional Amount of Derivatives | 41,391,000,000 | 41,636,000,000 | ||||||
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External Credit Rating, Non Investment Grade [Member] | Credit-related notes [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 63,000,000 | [2] | 145,000,000 | [2] | ||||
| One to Three Years | 170,000,000 | [2] | 107,000,000 | [2] | ||||
| Three to Five Years | 100,000,000 | [2] | 756,000,000 | [2] | ||||
| Over Five Years | 1,122,000,000 | [2] | 946,000,000 | [2] | ||||
| Gross Derivative Liabilities | $ 1,455,000,000 | [2] | $ 1,954,000,000 | [2] | ||||
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