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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 308,894 $ 289,563
Available-for-sale Securities, Equity Securities 2,776 2,894
Fair Value Option And Trading Securities 16,538 13,923
Short-term investments 7,217 6,523
Mortgage loans at estimated fair value 68,057 65,167
Derivative assets 8,792 12,139
Embedded derivatives within asset host contracts 5 55
Separate account assets 203,399 195,578
Liabilities [Abstract]    
Derivative liabilities 4,668 6,921
Embedded derivatives within liability host contracts 1,399 1,554
Separate account liabilities 203,399 195,578
Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 564 566
Recurring    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 308,894 289,563
Available-for-sale Securities, Equity Securities 2,776 2,894
Fair Value Option And Trading Securities 16,538 13,923
Short-term investments 6,638 6,005
Other investments 194 157
Derivative assets 8,792 12,139
Embedded derivatives within asset host contracts 145 143
Separate account assets 203,399 195,578
Total assets 547,940 520,968
Liabilities [Abstract]    
Derivative liabilities 4,668 6,921
Embedded derivatives within liability host contracts 1,399 1,554
Total liabilities 6,076 8,498
Recurring | Interest rate contracts    
Assets [Abstract]    
Derivative assets 5,714 7,561
Liabilities [Abstract]    
Derivative liabilities 867 2,225
Recurring | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,322 3,863
Liabilities [Abstract]    
Derivative liabilities 2,727 3,838
Recurring | Credit contracts    
Assets [Abstract]    
Derivative assets 267 175
Liabilities [Abstract]    
Derivative liabilities 47 49
Recurring | Equity market contracts    
Assets [Abstract]    
Derivative assets 489 540
Liabilities [Abstract]    
Derivative liabilities 1,027 809
Recurring | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 9 23
Recurring | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 564 566
Recurring | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 81,655 78,543
Recurring | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 60,789 55,976
Recurring | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 55,140 50,663
Recurring | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 47,664 44,433
Recurring | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 31,398 29,032
Recurring | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,345 12,231
Recurring | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,771 11,225
Recurring | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 8,132 7,460
Recurring | Level 1    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 26,788 24,943
Available-for-sale Securities, Equity Securities 1,332 1,334
Fair Value Option And Trading Securities 13,906 11,123
Short-term investments 3,925 4,091
Other investments 80 86
Derivative assets 17 33
Embedded derivatives within asset host contracts 0 0
Separate account assets 87,151 82,818
Total assets 133,199 124,428
Liabilities [Abstract]    
Derivative liabilities 31 15
Embedded derivatives within liability host contracts 0 0
Total liabilities 32 15
Recurring | Level 1 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 13 3
Liabilities [Abstract]    
Derivative liabilities 0 12
Recurring | Level 1 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 0 0
Liabilities [Abstract]    
Derivative liabilities 3 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 4 30
Liabilities [Abstract]    
Derivative liabilities 28 3
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 1 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 26,275 24,943
Recurring | Level 1 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 513 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 265,196 247,569
Available-for-sale Securities, Equity Securities 1,020 1,092
Fair Value Option And Trading Securities 2,328 2,513
Short-term investments 2,310 1,868
Other investments 114 71
Derivative assets 8,503 11,874
Embedded derivatives within asset host contracts 0 0
Separate account assets 115,207 111,612
Total assets 394,678 376,599
Liabilities [Abstract]    
Derivative liabilities 4,102 6,112
Embedded derivatives within liability host contracts 0 0
Total liabilities 4,108 6,128
Recurring | Level 2 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 5,698 7,556
Liabilities [Abstract]    
Derivative liabilities 655 1,713
Recurring | Level 2 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,218 3,783
Liabilities [Abstract]    
Derivative liabilities 2,686 3,784
Recurring | Level 2 | Credit contracts    
Assets [Abstract]    
Derivative assets 229 145
Liabilities [Abstract]    
Derivative liabilities 47 49
Recurring | Level 2 | Equity market contracts    
Assets [Abstract]    
Derivative assets 358 390
Liabilities [Abstract]    
Derivative liabilities 714 566
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 6 16
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 75,807 72,811
Recurring | Level 2 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 60,591 55,687
Recurring | Level 2 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 48,870 44,858
Recurring | Level 2 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 21,389 19,490
Recurring | Level 2 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 27,233 25,194
Recurring | Level 2 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,284 12,221
Recurring | Level 2 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,199 10,196
Recurring | Level 2 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 7,823 7,112
Recurring | Level 3    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,910 17,051
Available-for-sale Securities, Equity Securities 424 468
Fair Value Option And Trading Securities 304 287
Short-term investments 403 46
Other investments 0 0
Derivative assets 272 232
Embedded derivatives within asset host contracts 145 143
Separate account assets 1,041 1,148
Total assets 20,063 19,941
Liabilities [Abstract]    
Derivative liabilities 535 794
Embedded derivatives within liability host contracts 1,399 1,554
Total liabilities 1,936 2,355
Recurring | Level 3 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 3 2
Liabilities [Abstract]    
Derivative liabilities 212 500
Recurring | Level 3 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 104 80
Liabilities [Abstract]    
Derivative liabilities 38 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 127 120
Liabilities [Abstract]    
Derivative liabilities 285 240
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 2 7
Recurring | Level 3 | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 564 566
Recurring | Level 3 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 5,848 5,732
Recurring | Level 3 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 198 289
Recurring | Level 3 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,270 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 3,652 3,838
Recurring | Level 3 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 61 10
Recurring | Level 3 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 572 1,029
Recurring | Level 3 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 309 $ 348