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Derivatives - Credit Derivatives (Details) (USD $)
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Sep. 30, 2013
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Dec. 31, 2012
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| Carrying Value [Abstract] | ||||||||
| Derivative Liability, Fair Value, Gross Liability | $ 974,600,000,000 | $ 1,364,800,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 338,216,000,000 | 389,140,000,000 | ||||||
| One to Three Years | 463,589,000,000 | 459,211,000,000 | ||||||
| Three to Five Years | 599,238,000,000 | 617,917,000,000 | ||||||
| Over Five Years | 94,380,000,000 | 134,047,000,000 | ||||||
| Notional Amount of Derivatives | 1,495,423,000,000 | 1,600,315,000,000 | ||||||
| In Text Details [Abstract] | ||||||||
| Carrying value of written credit derivatives | 14,200,000,000 | 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 | 814,000,000 | 1,071,000,000 | ||||||
| One to Three Years | 3,399,000,000 | 5,264,000,000 | ||||||
| Three to Five Years | 7,067,000,000 | 12,664,000,000 | ||||||
| Over Five Years | 9,861,000,000 | 13,899,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 21,141,000,000 | 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 | 690,000,000 | 975,000,000 | ||||||
| One to Three Years | 3,334,000,000 | 5,160,000,000 | ||||||
| Three to Five Years | 7,032,000,000 | 12,625,000,000 | ||||||
| Over Five Years | 9,849,000,000 | 13,862,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 20,905,000,000 | 32,622,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 274,243,000,000 | 340,038,000,000 | ||||||
| One to Three Years | 457,324,000,000 | 448,168,000,000 | ||||||
| Three to Five Years | 593,494,000,000 | 610,286,000,000 | ||||||
| Over Five Years | 92,835,000,000 | 133,012,000,000 | ||||||
| Notional Amount of Derivatives | 1,417,896,000,000 | [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 | 124,000,000 | 96,000,000 | ||||||
| One to Three Years | 65,000,000 | 104,000,000 | ||||||
| Three to Five Years | 35,000,000 | 39,000,000 | ||||||
| Over Five Years | 12,000,000 | 37,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 236,000,000 | 276,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 63,973,000,000 | 49,102,000,000 | ||||||
| One to Three Years | 6,265,000,000 | 11,043,000,000 | ||||||
| Three to Five Years | 5,744,000,000 | 7,631,000,000 | ||||||
| Over Five Years | 1,545,000,000 | 1,035,000,000 | ||||||
| Notional Amount of Derivatives | 77,527,000,000 | [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 | 160,000,000 | [2] | 120,000,000 | [2] | ||||
| One to Three Years | 424,000,000 | [2] | 173,000,000 | [2] | ||||
| Three to Five Years | 993,000,000 | [2] | 755,000,000 | [2] | ||||
| Over Five Years | 5,685,000,000 | [2] | 5,274,000,000 | [2] | ||||
| Derivative Liability, Fair Value, Gross Liability | 7,262,000,000 | [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 | 11,000,000 | 52,000,000 | ||||||
| One to Three Years | 629,000,000 | 757,000,000 | ||||||
| Three to Five Years | 2,874,000,000 | 5,595,000,000 | ||||||
| Over Five Years | 2,039,000,000 | 2,903,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 5,553,000,000 | 9,307,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 211,697,000,000 | 260,177,000,000 | ||||||
| One to Three Years | 361,303,000,000 | 349,125,000,000 | ||||||
| Three to Five Years | 482,919,000,000 | 500,038,000,000 | ||||||
| Over Five Years | 56,592,000,000 | 90,453,000,000 | ||||||
| Notional Amount of Derivatives | 1,112,511,000,000 | 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 | 26,000,000 | 39,000,000 | ||||||
| Three to Five Years | 0 | |||||||
| Over Five Years | 0 | |||||||
| Derivative Liability, Fair Value, Gross Liability | 26,000,000 | 39,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 30,937,000,000 | 43,536,000,000 | ||||||
| One to Three Years | 15,000,000 | |||||||
| Three to Five Years | 0 | |||||||
| Notional Amount of Derivatives | 30,937,000,000 | 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 | 1,000,000 | [2] | 4,000,000 | [2] | ||||
| One to Three Years | 270,000,000 | [2] | 12,000,000 | [2] | ||||
| Three to Five Years | 291,000,000 | [2] | 441,000,000 | [2] | ||||
| Over Five Years | 4,705,000,000 | [2] | 3,849,000,000 | [2] | ||||
| Derivative Liability, Fair Value, Gross Liability | 5,267,000,000 | [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 | 679,000,000 | 923,000,000 | ||||||
| One to Three Years | 2,705,000,000 | 4,403,000,000 | ||||||
| Three to Five Years | 4,158,000,000 | 7,030,000,000 | ||||||
| Over Five Years | 7,810,000,000 | 10,959,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 15,352,000,000 | 23,315,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 62,546,000,000 | 79,861,000,000 | ||||||
| One to Three Years | 96,021,000,000 | 99,043,000,000 | ||||||
| Three to Five Years | 110,575,000,000 | 110,248,000,000 | ||||||
| Over Five Years | 36,243,000,000 | 42,559,000,000 | ||||||
| Notional Amount of Derivatives | 305,385,000,000 | 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 | 98,000,000 | 57,000,000 | ||||||
| One to Three Years | 65,000,000 | 104,000,000 | ||||||
| Three to Five Years | 35,000,000 | 39,000,000 | ||||||
| Over Five Years | 12,000,000 | 37,000,000 | ||||||
| Derivative Liability, Fair Value, Gross Liability | 210,000,000 | 237,000,000 | ||||||
| Notional Amount of Derivatives, [Abstract] | ||||||||
| Less than One Year | 33,036,000,000 | 5,566,000,000 | ||||||
| One to Three Years | 6,265,000,000 | 11,028,000,000 | ||||||
| Three to Five Years | 5,744,000,000 | 7,631,000,000 | ||||||
| Over Five Years | 1,545,000,000 | 1,035,000,000 | ||||||
| Notional Amount of Derivatives | 46,590,000,000 | 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 | 159,000,000 | [2] | 116,000,000 | [2] | ||||
| One to Three Years | 154,000,000 | [2] | 161,000,000 | [2] | ||||
| Three to Five Years | 702,000,000 | [2] | 314,000,000 | [2] | ||||
| Over Five Years | 980,000,000 | [2] | 1,425,000,000 | [2] | ||||
| Derivative Liability, Fair Value, Gross Liability | $ 1,995,000,000 | [2] | $ 2,016,000,000 | [2] | ||||
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