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Derivatives - Credit Derivatives (Details) (USD $)
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Mar. 31, 2014
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Dec. 31, 2013
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| Carrying Value [Abstract] | ||||||||
| Gross Derivative Liabilities | $ 809,500,000,000 | $ 906,400,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 271,280,000,000 | 273,635,000,000 | ||||||
| One to Three Years | 478,351,000,000 | 478,409,000,000 | ||||||
| Three to Five Years | 507,718,000,000 | 510,848,000,000 | ||||||
| Over Five Years | 91,132,000,000 | 65,895,000,000 | ||||||
| Notional Amount of Derivatives | 1,348,481,000,000 | 1,328,787,000,000 | ||||||
| In Text Details [Abstract] | ||||||||
| Carrying value of written credit derivatives | 6,300,000,000 | 8,100,000,000 | ||||||
| Notional Amount of Written Credit Derivatives With Identical Referenced Underlying Held by Entity | 994,300,000,000 | 1,000,000,000,000 | ||||||
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Credit Derivative [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 570,000,000 | 477,000,000 | ||||||
| One to Three Years | 2,122,000,000 | 2,182,000,000 | ||||||
| Three to Five Years | 2,777,000,000 | 3,445,000,000 | ||||||
| Over Five Years | 6,591,000,000 | 7,887,000,000 | ||||||
| Gross Derivative Liabilities | 12,060,000,000 | 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 | 521,000,000 | 426,000,000 | ||||||
| One to Three Years | 2,052,000,000 | 2,144,000,000 | ||||||
| Three to Five Years | 2,775,000,000 | 3,443,000,000 | ||||||
| Over Five Years | 6,584,000,000 | 7,801,000,000 | ||||||
| Gross Derivative Liabilities | 11,932,000,000 | 13,814,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 209,170,000,000 | 224,080,000,000 | ||||||
| One to Three Years | 468,387,000,000 | 470,259,000,000 | ||||||
| Three to Five Years | 504,449,000,000 | 506,745,000,000 | ||||||
| Over Five Years | 89,997,000,000 | 64,296,000,000 | ||||||
| Notional Amount of Derivatives | 1,272,003,000,000 | [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 | 49,000,000 | 51,000,000 | ||||||
| One to Three Years | 70,000,000 | 38,000,000 | ||||||
| Three to Five Years | 2,000,000 | 2,000,000 | ||||||
| Over Five Years | 7,000,000 | 86,000,000 | ||||||
| Gross Derivative Liabilities | 128,000,000 | 177,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 62,110,000,000 | 49,555,000,000 | ||||||
| One to Three Years | 9,964,000,000 | 8,150,000,000 | ||||||
| Three to Five Years | 3,269,000,000 | 4,103,000,000 | ||||||
| Over Five Years | 1,135,000,000 | 1,599,000,000 | ||||||
| Notional Amount of Derivatives | 76,478,000,000 | [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 | 126,000,000 | [2] | 145,000,000 | [2] | ||||
| One to Three Years | 388,000,000 | [2] | 385,000,000 | [2] | ||||
| Three to Five Years | 949,000,000 | [2] | 1,351,000,000 | [2] | ||||
| Over Five Years | 5,060,000,000 | [2] | 5,403,000,000 | [2] | ||||
| Gross Derivative Liabilities | 6,523,000,000 | [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 | 3,000,000 | 2,000,000 | ||||||
| One to Three Years | 219,000,000 | 220,000,000 | ||||||
| Three to Five Years | 756,000,000 | 974,000,000 | ||||||
| Over Five Years | 880,000,000 | 1,134,000,000 | ||||||
| Gross Derivative Liabilities | 1,858,000,000 | 2,330,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 161,359,000,000 | 170,764,000,000 | ||||||
| One to Three Years | 377,903,000,000 | 379,273,000,000 | ||||||
| Three to Five Years | 409,371,000,000 | 411,426,000,000 | ||||||
| Over Five Years | 57,499,000,000 | 36,039,000,000 | ||||||
| Notional Amount of Derivatives | 1,006,132,000,000 | 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 | 25,000,000 | 22,000,000 | ||||||
| One to Three Years | ||||||||
| Three to Five Years | ||||||||
| Over Five Years | ||||||||
| Gross Derivative Liabilities | 25,000,000 | 22,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 36,553,000,000 | 21,771,000,000 | ||||||
| One to Three Years | ||||||||
| Three to Five Years | ||||||||
| Over Five Years | ||||||||
| Notional Amount of Derivatives | 36,553,000,000 | 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 | 279,000,000 | [2] | 278,000,000 | [2] | ||||
| Three to Five Years | 601,000,000 | [2] | 595,000,000 | [2] | ||||
| Over Five Years | 4,024,000,000 | [2] | 4,457,000,000 | [2] | ||||
| Gross Derivative Liabilities | 4,906,000,000 | [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 | 518,000,000 | 424,000,000 | ||||||
| One to Three Years | 1,833,000,000 | 1,924,000,000 | ||||||
| Three to Five Years | 2,019,000,000 | 2,469,000,000 | ||||||
| Over Five Years | 5,704,000,000 | 6,667,000,000 | ||||||
| Gross Derivative Liabilities | 10,074,000,000 | 11,484,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 47,811,000,000 | 53,316,000,000 | ||||||
| One to Three Years | 90,484,000,000 | 90,986,000,000 | ||||||
| Three to Five Years | 95,078,000,000 | 95,319,000,000 | ||||||
| Over Five Years | 32,498,000,000 | 28,257,000,000 | ||||||
| Notional Amount of Derivatives | 265,871,000,000 | 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 | 24,000,000 | 29,000,000 | ||||||
| One to Three Years | 70,000,000 | 38,000,000 | ||||||
| Three to Five Years | 2,000,000 | 2,000,000 | ||||||
| Over Five Years | 7,000,000 | 86,000,000 | ||||||
| Gross Derivative Liabilities | 103,000,000 | 155,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 25,557,000,000 | 27,784,000,000 | ||||||
| One to Three Years | 9,964,000,000 | 8,150,000,000 | ||||||
| Three to Five Years | 3,269,000,000 | 4,103,000,000 | ||||||
| Over Five Years | 1,135,000,000 | 1,599,000,000 | ||||||
| Notional Amount of Derivatives | 39,925,000,000 | 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 | 124,000,000 | [2] | 145,000,000 | [2] | ||||
| One to Three Years | 109,000,000 | [2] | 107,000,000 | [2] | ||||
| Three to Five Years | 348,000,000 | [2] | 756,000,000 | [2] | ||||
| Over Five Years | 1,036,000,000 | [2] | 946,000,000 | [2] | ||||
| Gross Derivative Liabilities | $ 1,617,000,000 | [2] | $ 1,954,000,000 | [2] | ||||
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