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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 308,931 $ 289,563
Available-for-sale Securities, Equity Securities 2,513 2,894
Fair Value Option And Trading Securities 16,745 13,923
Short-term investments 4,870 6,523
Mortgage loans at estimated fair value 68,731 65,167
Derivative assets 8,551 12,139
Embedded derivatives within asset host contracts 12 55
Separate account assets 205,001 195,578
Liabilities [Abstract]    
Derivative liabilities 4,339 6,921
Embedded derivatives within liability host contracts 418 872
Separate account liabilities 205,001 195,578
Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 520 566
Recurring    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 308,931 289,563
Available-for-sale Securities, Equity Securities 2,513 2,894
Fair Value Option And Trading Securities 16,745 13,923
Short-term investments 4,286 6,005
Mortgage loans at estimated fair value 520  
Other investments 165 157
Derivative assets 8,551 12,139
Embedded derivatives within asset host contracts 144 143
Separate account assets 205,001 195,578
Total assets 546,856 520,968
Liabilities [Abstract]    
Derivative liabilities 4,339 6,921
Embedded derivatives within liability host contracts 418 872
Separate account liabilities 9 23
Total liabilities 4,766 7,816
Recurring | Interest rate contracts    
Assets [Abstract]    
Derivative assets 5,563 7,561
Liabilities [Abstract]    
Derivative liabilities 772 2,225
Recurring | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,069 3,863
Liabilities [Abstract]    
Derivative liabilities 2,590 3,838
Recurring | Credit contracts    
Assets [Abstract]    
Derivative assets 278 175
Liabilities [Abstract]    
Derivative liabilities 43 49
Recurring | Equity market contracts    
Assets [Abstract]    
Derivative assets 641 540
Liabilities [Abstract]    
Derivative liabilities 934 809
Recurring | Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value   566
Recurring | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 82,661 78,543
Recurring | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 61,534 55,976
Recurring | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 55,569 50,663
Recurring | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 47,394 44,433
Recurring | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 28,800 29,032
Recurring | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,455 12,231
Recurring | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,291 11,225
Recurring | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 8,227 7,460
Recurring | Level 1    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 26,052 24,943
Available-for-sale Securities, Equity Securities 1,104 1,334
Fair Value Option And Trading Securities 14,028 11,123
Short-term investments 3,001 4,091
Mortgage loans at estimated fair value 0  
Other investments 81 86
Derivative assets 22 33
Embedded derivatives within asset host contracts 0 0
Separate account assets 89,916 82,818
Total assets 134,204 124,428
Liabilities [Abstract]    
Derivative liabilities 8 15
Embedded derivatives within liability host contracts 0 0
Separate account liabilities 0 0
Total liabilities 8 15
Recurring | Level 1 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 2 3
Liabilities [Abstract]    
Derivative liabilities 4 12
Recurring | Level 1 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2 0
Liabilities [Abstract]    
Derivative liabilities 0 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 18 30
Liabilities [Abstract]    
Derivative liabilities 4 3
Recurring | Level 1 | Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value   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 26,052 24,943
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 266,610 247,569
Available-for-sale Securities, Equity Securities 981 1,092
Fair Value Option And Trading Securities 2,355 2,513
Short-term investments 1,252 1,868
Mortgage loans at estimated fair value 0  
Other investments 84 71
Derivative assets 8,295 11,874
Embedded derivatives within asset host contracts 0 0
Separate account assets 114,124 111,612
Total assets 393,701 376,599
Liabilities [Abstract]    
Derivative liabilities 3,965 6,112
Embedded derivatives within liability host contracts 0 0
Separate account liabilities 7 16
Total liabilities 3,972 6,128
Recurring | Level 2 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 5,553 7,556
Liabilities [Abstract]    
Derivative liabilities 638 1,713
Recurring | Level 2 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 1,954 3,783
Liabilities [Abstract]    
Derivative liabilities 2,553 3,784
Recurring | Level 2 | Credit contracts    
Assets [Abstract]    
Derivative assets 240 145
Liabilities [Abstract]    
Derivative liabilities 43 49
Recurring | Level 2 | Equity market contracts    
Assets [Abstract]    
Derivative assets 548 390
Liabilities [Abstract]    
Derivative liabilities 731 566
Recurring | Level 2 | Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value   0
Recurring | Level 2 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 78,171 72,811
Recurring | Level 2 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 61,325 55,687
Recurring | Level 2 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 48,840 44,858
Recurring | Level 2 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 21,342 19,490
Recurring | Level 2 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 25,339 25,194
Recurring | Level 2 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,455 12,221
Recurring | Level 2 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,204 10,196
Recurring | Level 2 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 7,934 7,112
Recurring | Level 3    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,269 17,051
Available-for-sale Securities, Equity Securities 428 468
Fair Value Option And Trading Securities 362 287
Short-term investments 33 46
Mortgage loans at estimated fair value 520  
Other investments 0 0
Derivative assets 234 232
Embedded derivatives within asset host contracts 144 143
Separate account assets 961 1,148
Total assets 18,951 19,941
Liabilities [Abstract]    
Derivative liabilities 366 794
Embedded derivatives within liability host contracts 418 872
Separate account liabilities 2 7
Total liabilities 786 1,673
Recurring | Level 3 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 8 2
Liabilities [Abstract]    
Derivative liabilities 130 500
Recurring | Level 3 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 113 80
Liabilities [Abstract]    
Derivative liabilities 37 54
Recurring | Level 3 | Credit contracts    
Assets [Abstract]    
Derivative assets 38 30
Liabilities [Abstract]    
Derivative liabilities 0 0
Recurring | Level 3 | Equity market contracts    
Assets [Abstract]    
Derivative assets 75 120
Liabilities [Abstract]    
Derivative liabilities 199 240
Recurring | Level 3 | Residential mortgage loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value   566
Recurring | Level 3 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 4,490 5,732
Recurring | Level 3 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 209 289
Recurring | Level 3 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,729 5,805
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 3,461 3,838
Recurring | Level 3 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 10
Recurring | Level 3 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,087 1,029
Recurring | Level 3 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 293 $ 348