Derivatives - Credit Derivatives (Details) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Carrying Value [Abstract] | ||||||||||
Carrying Value, Total | $ 906,400,000,000 | $ 1,364,800,000,000 | ||||||||
Notional Disclosures [Abstract] | ||||||||||
Notional Amount, Less than One Year | 273,635,000,000 | 389,140,000,000 | ||||||||
Notional Amount, One to Three Years | 478,409,000,000 | 459,211,000,000 | ||||||||
Notional Amount, Three to Five Years | 510,848,000,000 | 617,917,000,000 | ||||||||
Notional Amount, Over Five Years | 65,895,000,000 | 134,047,000,000 | ||||||||
Notional Amount, Total | 1,328,787,000,000 | 1,600,315,000,000 | ||||||||
In Text Details [Abstract] | ||||||||||
Carrying value of written credit derivatives | 8,100,000,000 | 20,700,000,000 | ||||||||
Notional Amount of Written Credit Derivatives With Identical Referenced Underlying Held by Entity | 1,000,000,000,000 | 1,100,000,000,000 | ||||||||
Credit Derivative [Member]
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Carrying Value [Abstract] | ||||||||||
Carrying Value, Less than One Year | 477,000,000 | 1,071,000,000 | ||||||||
Carrying Value, One to Three Years | 2,182,000,000 | 5,264,000,000 | ||||||||
Carrying Value, Three to Five Years | 3,445,000,000 | 12,664,000,000 | ||||||||
Carrying Value, Over Five Years | 7,887,000,000 | 13,899,000,000 | ||||||||
Carrying Value, Total | 13,991,000,000 | 32,898,000,000 | ||||||||
Credit Default Swap [Member] | Credit Risk Contract [Member] | Credit Default Swap, Selling Protection [Member]
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Carrying Value [Abstract] | ||||||||||
Carrying Value, Less than One Year | 426,000,000 | 975,000,000 | ||||||||
Carrying Value, One to Three Years | 2,144,000,000 | 5,160,000,000 | ||||||||
Carrying Value, Three to Five Years | 3,443,000,000 | 12,625,000,000 | ||||||||
Carrying Value, Over Five Years | 7,801,000,000 | 13,862,000,000 | ||||||||
Carrying Value, Total | 13,814,000,000 | 32,622,000,000 | ||||||||
Notional Disclosures [Abstract] | ||||||||||
Notional Amount, Less than One Year | 224,080,000,000 | 340,038,000,000 | ||||||||
Notional Amount, One to Three Years | 470,259,000,000 | 448,168,000,000 | ||||||||
Notional Amount, Three to Five Years | 506,745,000,000 | 610,286,000,000 | ||||||||
Notional Amount, Over Five Years | 64,296,000,000 | 133,012,000,000 | ||||||||
Notional Amount, Total | 1,265,380,000,000 | [1] | 1,531,504,000,000 | [2] | ||||||
Return Swaps Other [Member] | Credit Risk Contract [Member] | Credit Default Swap, Selling Protection [Member]
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Carrying Value [Abstract] | ||||||||||
Carrying Value, Less than One Year | 51,000,000 | 96,000,000 | ||||||||
Carrying Value, One to Three Years | 38,000,000 | 104,000,000 | ||||||||
Carrying Value, Three to Five Years | 2,000,000 | 39,000,000 | ||||||||
Carrying Value, Over Five Years | 86,000,000 | 37,000,000 | ||||||||
Carrying Value, Total | 177,000,000 | 276,000,000 | ||||||||
Notional Disclosures [Abstract] | ||||||||||
Notional Amount, Less than One Year | 49,555,000,000 | 49,102,000,000 | ||||||||
Notional Amount, One to Three Years | 8,150,000,000 | 11,043,000,000 | ||||||||
Notional Amount, Three to Five Years | 4,103,000,000 | 7,631,000,000 | ||||||||
Notional Amount, Over Five Years | 1,599,000,000 | 1,035,000,000 | ||||||||
Notional Amount, Total | 63,407,000,000 | [1] | 68,811,000,000 | [2] | ||||||
Credit-related notes [Member]
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Carrying Value [Abstract] | ||||||||||
Carrying Value, Less than One Year | 145,000,000,000 | [3] | 120,000,000 | [3] | ||||||
Carrying Value, One to Three Years | 385,000,000,000 | [3] | 173,000,000 | [3] | ||||||
Carrying Value, Three to Five Years | 1,351,000,000,000 | [3] | 755,000,000 | [3] | ||||||
Carrying Value, Over Five Years | 5,403,000,000,000 | [3] | 5,274,000,000 | [3] | ||||||
Carrying Value, Total | 7,284,000,000,000 | [3] | 6,322,000,000 | [3] | ||||||
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] | ||||||||||
Carrying Value, Less than One Year | 2,000,000 | 52,000,000 | ||||||||
Carrying Value, One to Three Years | 220,000,000 | 757,000,000 | ||||||||
Carrying Value, Three to Five Years | 974,000,000 | 5,595,000,000 | ||||||||
Carrying Value, Over Five Years | 1,134,000,000 | 2,903,000,000 | ||||||||
Carrying Value, Total | 2,330,000,000 | 9,307,000,000 | ||||||||
Notional Disclosures [Abstract] | ||||||||||
Notional Amount, Less than One Year | 170,764,000,000 | 260,177,000,000 | ||||||||
Notional Amount, One to Three Years | 379,273,000,000 | 349,125,000,000 | ||||||||
Notional Amount, Three to Five Years | 411,426,000,000 | 500,038,000,000 | ||||||||
Notional Amount, Over Five Years | 36,039,000,000 | 90,453,000,000 | ||||||||
Notional Amount, Total | 997,502,000,000 | 1,199,793,000,000 | ||||||||
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] | ||||||||||
Carrying Value, Less than One Year | 22,000,000 | 39,000,000 | ||||||||
Carrying Value, Three to Five Years | 0 | |||||||||
Carrying Value, Over Five Years | 0 | |||||||||
Carrying Value, Total | 22,000,000 | 39,000,000 | ||||||||
Notional Disclosures [Abstract] | ||||||||||
Notional Amount, Less than One Year | 21,771,000,000 | 43,536,000,000 | ||||||||
Notional Amount, One to Three Years | 15,000,000 | |||||||||
Notional Amount, Three to Five Years | 0 | |||||||||
Notional Amount, Over Five Years | 0 | |||||||||
Notional Amount, Total | 21,771,000,000 | 43,551,000,000 | ||||||||
External Credit Rating, Investment Grade [Member] | Credit-related notes [Member]
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Carrying Value [Abstract] | ||||||||||
Carrying Value, Less than One Year | 4,000,000 | [3] | ||||||||
Carrying Value, One to Three Years | 278,000,000,000 | [3] | 12,000,000 | [3] | ||||||
Carrying Value, Three to Five Years | 595,000,000,000 | [3] | 441,000,000 | [3] | ||||||
Carrying Value, Over Five Years | 4,457,000,000,000 | [3] | 3,849,000,000 | [3] | ||||||
Carrying Value, Total | 5,330,000,000,000 | [3] | 4,306,000,000 | [3] | ||||||
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] | ||||||||||
Carrying Value, Less than One Year | 424,000,000 | 923,000,000 | ||||||||
Carrying Value, One to Three Years | 1,924,000,000 | 4,403,000,000 | ||||||||
Carrying Value, Three to Five Years | 2,469,000,000 | 7,030,000,000 | ||||||||
Carrying Value, Over Five Years | 6,667,000,000 | 10,959,000,000 | ||||||||
Carrying Value, Total | 11,484,000,000 | 23,315,000,000 | ||||||||
Notional Disclosures [Abstract] | ||||||||||
Notional Amount, Less than One Year | 53,316,000,000 | 79,861,000,000 | ||||||||
Notional Amount, One to Three Years | 90,986,000,000 | 99,043,000,000 | ||||||||
Notional Amount, Three to Five Years | 95,319,000,000 | 110,248,000,000 | ||||||||
Notional Amount, Over Five Years | 28,257,000,000 | 42,559,000,000 | ||||||||
Notional Amount, Total | 267,878,000,000 | 331,711,000,000 | ||||||||
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] | ||||||||||
Carrying Value, Less than One Year | 29,000,000 | 57,000,000 | ||||||||
Carrying Value, One to Three Years | 38,000,000 | 104,000,000 | ||||||||
Carrying Value, Three to Five Years | 2,000,000 | 39,000,000 | ||||||||
Carrying Value, Over Five Years | 86,000,000 | 37,000,000 | ||||||||
Carrying Value, Total | 155,000,000 | 237,000,000 | ||||||||
Notional Disclosures [Abstract] | ||||||||||
Notional Amount, Less than One Year | 27,784,000,000 | 5,566,000,000 | ||||||||
Notional Amount, One to Three Years | 8,150,000,000 | 11,028,000,000 | ||||||||
Notional Amount, Three to Five Years | 4,103,000,000 | 7,631,000,000 | ||||||||
Notional Amount, Over Five Years | 1,599,000,000 | 1,035,000,000 | ||||||||
Notional Amount, Total | 41,636,000,000 | 25,260,000,000 | ||||||||
External Credit Rating, Non Investment Grade [Member] | Credit-related notes [Member]
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Carrying Value [Abstract] | ||||||||||
Carrying Value, Less than One Year | 145,000,000,000 | [3] | 116,000,000 | [3] | ||||||
Carrying Value, One to Three Years | 107,000,000,000 | [3] | 161,000,000 | [3] | ||||||
Carrying Value, Three to Five Years | 756,000,000,000 | [3] | 314,000,000 | [3] | ||||||
Carrying Value, Over Five Years | 946,000,000,000 | [3] | 1,425,000,000 | [3] | ||||||
Carrying Value, Total | $ 1,954,000,000,000 | [3] | $ 2,016,000,000 | [3] | ||||||
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