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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 304,711,000,000 $ 308,931,000,000
Available-for-sale Securities, Equity Securities 1,544,000,000 2,513,000,000
Fair Value Option And Trading Securities 16,444,000,000 16,745,000,000
Short-term investments 5,121,000,000 4,870,000,000
Mortgage loans at estimated fair value 71,055,000,000 68,731,000,000
Derivative assets 7,924,000,000 8,551,000,000
Embedded derivatives within asset host contracts 157,000,000 12,000,000
Separate account assets 196,358,000,000 205,001,000,000
Liabilities [Abstract]    
Derivative liabilities 4,075,000,000 4,339,000,000
Embedded derivatives within liability host contracts 485,000,000 418,000,000
Separate account liabilities 196,358,000,000 205,001,000,000
Net Embedded Derivatives    
Assets [Abstract]    
Available-for-sale Securities 0 (132,000,000)
Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 438,000,000 520,000,000
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Minimum    
Assets [Abstract]    
Fair Value Option And Trading Securities 0.85 0.85
Recurring    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 304,711,000,000 308,931,000,000
Available-for-sale Securities, Equity Securities 1,544,000,000 2,513,000,000
Fair Value Option And Trading Securities 16,444,000,000 16,745,000,000
Other limited partnership interests 194,000,000  
Short-term investments 4,450,000,000 4,286,000,000
Other investments 173,000,000 165,000,000
Derivative assets 7,924,000,000 8,551,000,000
Embedded derivatives within asset host contracts 157,000,000 144,000,000
Separate account assets 196,358,000,000 205,001,000,000
Total assets 532,393,000,000 546,856,000,000
Liabilities [Abstract]    
Derivative liabilities 4,075,000,000 4,339,000,000
Embedded derivatives within liability host contracts 485,000,000 418,000,000
Total liabilities 4,577,000,000 4,766,000,000
Recurring | Interest rate contracts    
Assets [Abstract]    
Derivative assets 4,744,000,000 5,563,000,000
Liabilities [Abstract]    
Derivative liabilities 594,000,000 772,000,000
Recurring | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,277,000,000 2,069,000,000
Liabilities [Abstract]    
Derivative liabilities 2,622,000,000 2,590,000,000
Recurring | Credit contracts    
Assets [Abstract]    
Derivative assets 215,000,000 278,000,000
Liabilities [Abstract]    
Derivative liabilities 43,000,000 43,000,000
Recurring | Equity market contracts    
Assets [Abstract]    
Derivative assets 688,000,000 641,000,000
Liabilities [Abstract]    
Derivative liabilities 816,000,000 934,000,000
Recurring | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 17,000,000 9,000,000
Recurring | Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 438,000,000 520,000,000
Recurring | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 81,834,000,000 82,661,000,000
Recurring | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 64,510,000,000 61,534,000,000
Recurring | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 55,463,000,000 55,569,000,000
Recurring | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 43,827,000,000 47,394,000,000
Recurring | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 27,411,000,000 28,800,000,000
Recurring | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,192,000,000 12,455,000,000
Recurring | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,764,000,000 12,291,000,000
Recurring | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 7,710,000,000 8,227,000,000
Recurring | Level 1    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 22,873,000,000 26,052,000,000
Available-for-sale Securities, Equity Securities 909,000,000 1,104,000,000
Fair Value Option And Trading Securities 13,705,000,000 14,028,000,000
Other limited partnership interests 0  
Short-term investments 2,845,000,000 3,001,000,000
Other investments 83,000,000 81,000,000
Derivative assets 9,000,000 22,000,000
Embedded derivatives within asset host contracts 0 0
Separate account assets 88,618,000,000 89,916,000,000
Total assets 129,042,000,000 134,204,000,000
Liabilities [Abstract]    
Derivative liabilities 30,000,000 8,000,000
Embedded derivatives within liability host contracts 0 0
Total liabilities 30,000,000 8,000,000
Recurring | Level 1 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 2,000,000 2,000,000
Liabilities [Abstract]    
Derivative liabilities 3,000,000 4,000,000
Recurring | Level 1 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 0 2,000,000
Liabilities [Abstract]    
Derivative liabilities 8,000,000 0
Recurring | Level 1 | Credit contracts    
Assets [Abstract]    
Derivative assets 0 0
Liabilities [Abstract]    
Derivative liabilities 0 0
Recurring | Level 1 | Equity market contracts    
Assets [Abstract]    
Derivative assets 7,000,000 18,000,000
Liabilities [Abstract]    
Derivative liabilities 19,000,000 4,000,000
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 0 0
Recurring | Level 1 | Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 0 0
Recurring | Level 1 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 1 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 1 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 1 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 22,873,000,000 26,052,000,000
Recurring | Level 1 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 1 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 1 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 1 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 2    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 266,267,000,000 266,610,000,000
Available-for-sale Securities, Equity Securities 213,000,000 981,000,000
Fair Value Option And Trading Securities 2,453,000,000 2,355,000,000
Other limited partnership interests 0  
Short-term investments 990,000,000 1,252,000,000
Other investments 90,000,000 84,000,000
Derivative assets 7,631,000,000 8,295,000,000
Embedded derivatives within asset host contracts 0 0
Separate account assets 106,511,000,000 114,124,000,000
Total assets 384,155,000,000 393,701,000,000
Liabilities [Abstract]    
Derivative liabilities 3,579,000,000 3,965,000,000
Embedded derivatives within liability host contracts 0 0
Total liabilities 3,591,000,000 3,972,000,000
Recurring | Level 2 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 4,728,000,000 5,553,000,000
Liabilities [Abstract]    
Derivative liabilities 348,000,000 638,000,000
Recurring | Level 2 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,120,000,000 1,954,000,000
Liabilities [Abstract]    
Derivative liabilities 2,585,000,000 2,553,000,000
Recurring | Level 2 | Credit contracts    
Assets [Abstract]    
Derivative assets 180,000,000 240,000,000
Liabilities [Abstract]    
Derivative liabilities 43,000,000 43,000,000
Recurring | Level 2 | Equity market contracts    
Assets [Abstract]    
Derivative assets 603,000,000 548,000,000
Liabilities [Abstract]    
Derivative liabilities 603,000,000 731,000,000
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 12,000,000 7,000,000
Recurring | Level 2 | Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 0 0
Recurring | Level 2 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 77,597,000,000 78,171,000,000
Recurring | Level 2 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 64,331,000,000 61,325,000,000
Recurring | Level 2 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 48,890,000,000 48,840,000,000
Recurring | Level 2 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 20,954,000,000 21,342,000,000
Recurring | Level 2 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 24,155,000,000 25,339,000,000
Recurring | Level 2 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,192,000,000 12,455,000,000
Recurring | Level 2 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 10,739,000,000 11,204,000,000
Recurring | Level 2 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 7,409,000,000 7,934,000,000
Recurring | Level 3    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 15,571,000,000 16,269,000,000
Available-for-sale Securities, Equity Securities 422,000,000 428,000,000
Fair Value Option And Trading Securities 286,000,000 362,000,000
Other limited partnership interests 194,000,000  
Short-term investments 615,000,000 33,000,000
Other investments 0 0
Derivative assets 284,000,000 234,000,000
Embedded derivatives within asset host contracts 157,000,000 144,000,000
Separate account assets 1,229,000,000 961,000,000
Total assets 19,196,000,000 18,951,000,000
Liabilities [Abstract]    
Derivative liabilities 466,000,000 366,000,000
Embedded derivatives within liability host contracts 485,000,000 418,000,000
Total liabilities 956,000,000 786,000,000
Recurring | Level 3 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 14,000,000 8,000,000
Liabilities [Abstract]    
Derivative liabilities 243,000,000 130,000,000
Recurring | Level 3 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 157,000,000 113,000,000
Liabilities [Abstract]    
Derivative liabilities 29,000,000 37,000,000
Recurring | Level 3 | Credit contracts    
Assets [Abstract]    
Derivative assets 35,000,000 38,000,000
Liabilities [Abstract]    
Derivative liabilities 0 0
Recurring | Level 3 | Equity market contracts    
Assets [Abstract]    
Derivative assets 78,000,000 75,000,000
Liabilities [Abstract]    
Derivative liabilities 194,000,000 199,000,000
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 5,000,000 2,000,000
Recurring | Level 3 | Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 438,000,000 520,000,000
Recurring | Level 3 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 4,237,000,000 4,490,000,000
Recurring | Level 3 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 179,000,000 209,000,000
Recurring | Level 3 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,573,000,000 6,729,000,000
Recurring | Level 3 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 3 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 3,256,000,000 3,461,000,000
Recurring | Level 3 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 3 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,025,000,000 1,087,000,000
Recurring | Level 3 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 301,000,000 $ 293,000,000