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Derivatives - Credit Derivatives (Details) (USD $)
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Jun. 30, 2013
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Dec. 31, 2012
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| Carrying Value [Abstract] | ||||||||
| Derivative Liability, Fair Value, Gross Liability | $ 1,008,200,000,000 | $ 1,364,800,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 336,715,000,000 | 389,140,000,000 | ||||||
| One to Three Years | 464,660,000,000 | 459,211,000,000 | ||||||
| Three to Five Years | 678,759,000,000 | 617,917,000,000 | ||||||
| Over Five Years | 80,321,000,000 | 134,047,000,000 | ||||||
| Notional Amount of Derivatives | 1,560,455,000,000 | 1,600,315,000,000 | ||||||
| In Text Details [Abstract] | ||||||||
| Carrying value of written credit derivatives | 17,400,000,000 | 20,700,000,000 | ||||||
| Notional Amount of Written Credit Derivatives With Identical Referenced Underlying Held by Entity | 1,100,000,000,000 | 1,100,000,000,000 | ||||||
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Credit Derivative [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 845,000,000 | 1,071,000,000 | ||||||
| One to Three Years | 3,900,000,000 | 5,264,000,000 | ||||||
| Three to Five Years | 11,303,000,000 | 12,664,000,000 | ||||||
| Over Five Years | 10,575,000,000 | 13,899,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 26,623,000,000 | 32,898,000,000 | ||||||
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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 | 553,000,000 | 975,000,000 | ||||||
| One to Three Years | 3,857,000,000 | 5,160,000,000 | ||||||
| Three to Five Years | 11,284,000,000 | 12,625,000,000 | ||||||
| Over Five Years | 10,563,000,000 | 13,862,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 26,257,000,000 | 32,622,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 281,383,000,000 | 340,038,000,000 | ||||||
| One to Three Years | 459,607,000,000 | 448,168,000,000 | ||||||
| Three to Five Years | 671,417,000,000 | 610,286,000,000 | ||||||
| Over Five Years | 78,594,000,000 | 133,012,000,000 | ||||||
| Notional Amount of Derivatives | 1,491,001,000,000 | [1] | 1,531,504,000,000 | [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 | 292,000,000 | 96,000,000 | ||||||
| One to Three Years | 43,000,000 | 104,000,000 | ||||||
| Three to Five Years | 19,000,000 | 39,000,000 | ||||||
| Over Five Years | 12,000,000 | 37,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 366,000,000 | 276,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 55,332,000,000 | 49,102,000,000 | ||||||
| One to Three Years | 5,053,000,000 | 11,043,000,000 | ||||||
| Three to Five Years | 7,342,000,000 | 7,631,000,000 | ||||||
| Over Five Years | 1,727,000,000 | 1,035,000,000 | ||||||
| Notional Amount of Derivatives | 69,454,000,000 | [1] | 68,811,000,000 | [1] | ||||
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Credit-related notes [Member]
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| Carrying Value [Abstract] | ||||||||
| Less than One Year | 82,000,000 | [2] | 120,000,000 | [2] | ||||
| One to Three Years | 475,000,000 | [2] | 173,000,000 | [2] | ||||
| Three to Five Years | 768,000,000 | [2] | 755,000,000 | [2] | ||||
| Over Five Years | 5,926,000,000 | [2] | 5,274,000,000 | [2] | ||||
| Derivative Liability, Fair Value, Gross Liability | 7,251,000,000 | [2] | 6,322,000,000 | [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 | 28,000,000 | 52,000,000 | ||||||
| One to Three Years | 973,000,000 | 757,000,000 | ||||||
| Three to Five Years | 5,666,000,000 | 5,595,000,000 | ||||||
| Over Five Years | 2,459,000,000 | 2,903,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 9,126,000,000 | 9,307,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 216,854,000,000 | 260,177,000,000 | ||||||
| One to Three Years | 360,812,000,000 | 349,125,000,000 | ||||||
| Three to Five Years | 554,655,000,000 | 500,038,000,000 | ||||||
| Over Five Years | 45,229,000,000 | 90,453,000,000 | ||||||
| Notional Amount of Derivatives | 1,177,550,000,000 | 1,199,793,000,000 | ||||||
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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 | 69,000,000 | 39,000,000 | ||||||
| Three to Five Years | 0 | |||||||
| Over Five Years | 0 | |||||||
| Derivative Liability, Fair Value, Gross Liability | 69,000,000 | 39,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 23,646,000,000 | 43,536,000,000 | ||||||
| One to Three Years | 15,000,000 | |||||||
| Three to Five Years | 0 | |||||||
| Notional Amount of Derivatives | 23,646,000,000 | 43,551,000,000 | ||||||
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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 | 32,000,000 | [2] | 4,000,000 | [2] | ||||
| One to Three Years | 279,000,000 | [2] | 12,000,000 | [2] | ||||
| Three to Five Years | 221,000,000 | [2] | 441,000,000 | [2] | ||||
| Over Five Years | 4,350,000,000 | [2] | 3,849,000,000 | [2] | ||||
| Derivative Liability, Fair Value, Gross Liability | 4,882,000,000 | [2] | 4,306,000,000 | [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 | 525,000,000 | 923,000,000 | ||||||
| One to Three Years | 2,884,000,000 | 4,403,000,000 | ||||||
| Three to Five Years | 5,618,000,000 | 7,030,000,000 | ||||||
| Over Five Years | 8,104,000,000 | 10,959,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 17,131,000,000 | 23,315,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 64,529,000,000 | 79,861,000,000 | ||||||
| One to Three Years | 98,795,000,000 | 99,043,000,000 | ||||||
| Three to Five Years | 116,762,000,000 | 110,248,000,000 | ||||||
| Over Five Years | 33,365,000,000 | 42,559,000,000 | ||||||
| Notional Amount of Derivatives | 313,451,000,000 | 331,711,000,000 | ||||||
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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 | 223,000,000 | 57,000,000 | ||||||
| One to Three Years | 43,000,000 | 104,000,000 | ||||||
| Three to Five Years | 19,000,000 | 39,000,000 | ||||||
| Over Five Years | 12,000,000 | 37,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 297,000,000 | 237,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 31,686,000,000 | 5,566,000,000 | ||||||
| One to Three Years | 5,053,000,000 | 11,028,000,000 | ||||||
| Three to Five Years | 7,342,000,000 | 7,631,000,000 | ||||||
| Over Five Years | 1,727,000,000 | 1,035,000,000 | ||||||
| Notional Amount of Derivatives | 45,808,000,000 | 25,260,000,000 | ||||||
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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 | 50,000,000 | [2] | 116,000,000 | [2] | ||||
| One to Three Years | 196,000,000 | [2] | 161,000,000 | [2] | ||||
| Three to Five Years | 547,000,000 | [2] | 314,000,000 | [2] | ||||
| Over Five Years | 1,576,000,000 | [2] | 1,425,000,000 | [2] | ||||
| Derivative Liability, Fair Value, Gross Liability | $ 2,369,000,000 | [2] | $ 2,016,000,000 | [2] | ||||
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