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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 350,889 $ 351,402
Available-for-sale Securities, Equity Securities 3,194 3,321
Fair Value Option And Trading Securities 13,923 15,024
Short-term investments 7,810 9,299
Mortgage loans at estimated fair value 74,545 67,102
Derivative assets 15,761 14,406
Net embedded derivatives within asset host contracts 243 171
Separate account assets 308,620 301,598
Liabilities [Abstract]    
Derivative liabilities 10,804 7,049
Net embedded derivatives within liability host contracts 4,105 935
Separate account liabilities 308,620 301,598
Residential Mortgage Loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 566 314
Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 136 172
Recurring    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 350,889 351,402
Available-for-sale Securities, Equity Securities 3,194 3,321
Fair Value Option And Trading Securities 13,923 15,024
Short-term investments 7,291 8,819
Mortgage loans at estimated fair value 702 486
Other investments 157 162
Derivative assets 15,761 14,406
Net embedded derivatives within asset host contracts 380 391
Separate account assets 308,620 301,598
Total assets 700,917 695,609
Liabilities [Abstract]    
Derivative liabilities 10,804 7,049
Net embedded derivatives within liability host contracts 4,105 935
Trading liabilities 0 153
Separate account liabilities 23 0
Total liabilities 14,932 8,137
Recurring | Interest rate contracts    
Assets [Abstract]    
Derivative assets 9,713 9,434
Liabilities [Abstract]    
Derivative liabilities 4,525 2,347
Recurring | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 4,229 3,019
Liabilities [Abstract]    
Derivative liabilities 3,853 2,902
Recurring | Credit contracts    
Assets [Abstract]    
Derivative assets 203 106
Liabilities [Abstract]    
Derivative liabilities 49 47
Recurring | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,616 1,847
Liabilities [Abstract]    
Derivative liabilities 2,377 1,753
Recurring | Residential Mortgage Loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 566 314
Recurring | Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 136 172
Recurring | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 100,853 100,794
Recurring | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 57,523 61,646
Recurring | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 57,138 50,499
Recurring | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 57,057 57,198
Recurring | RMBS (1)    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 36,993 38,797
Recurring | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,176 15,441
Recurring | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 13,877 14,394
Recurring | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,272 12,633
Recurring | Level 1    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 31,153 37,660
Available-for-sale Securities, Equity Securities 1,373 1,274
Fair Value Option And Trading Securities 11,123 11,335
Short-term investments 4,808 2,543
Mortgage loans at estimated fair value 0 0
Other investments 86 109
Derivative assets 80 67
Net embedded derivatives within asset host contracts 0 0
Separate account assets 83,538 77,080
Total assets 132,161 130,068
Liabilities [Abstract]    
Derivative liabilities 15 25
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 0 103
Separate account liabilities 0 0
Total liabilities 15 128
Recurring | Level 1 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 12 4
Liabilities [Abstract]    
Derivative liabilities 12 7
Recurring | Level 1 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 0 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 68 63
Liabilities [Abstract]    
Derivative liabilities 3 18
Recurring | Level 1 | Residential Mortgage Loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 0 0
Recurring | Level 1 | Consolidated Securitization Entities    
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 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 31,153 37,660
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 | RMBS (1)    
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 298,627 292,928
Available-for-sale Securities, Equity Securities 1,217 1,615
Fair Value Option And Trading Securities 2,513 3,419
Short-term investments 2,436 5,985
Mortgage loans at estimated fair value 136 172
Other investments 71 53
Derivative assets 15,262 13,942
Net embedded derivatives within asset host contracts 0 0
Separate account assets 223,923 222,814
Total assets 544,185 540,928
Liabilities [Abstract]    
Derivative liabilities 8,854 6,216
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 0 50
Separate account liabilities 16 0
Total liabilities 8,870 6,266
Recurring | Level 2 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 9,699 9,405
Liabilities [Abstract]    
Derivative liabilities 3,402 2,340
Recurring | Level 2 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 4,149 3,003
Liabilities [Abstract]    
Derivative liabilities 3,799 2,754
Recurring | Level 2 | Credit contracts    
Assets [Abstract]    
Derivative assets 165 99
Liabilities [Abstract]    
Derivative liabilities 49 45
Recurring | Level 2 | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,249 1,435
Liabilities [Abstract]    
Derivative liabilities 1,604 1,077
Recurring | Level 2 | Residential Mortgage Loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 0 0
Recurring | Level 2 | Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 136 172
Recurring | Level 2 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 93,639 93,758
Recurring | Level 2 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 26,370 23,986
Recurring | Level 2 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 56,848 49,643
Recurring | Level 2 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 50,344 51,438
Recurring | Level 2 | RMBS (1)    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 31,896 34,088
Recurring | Level 2 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,149 15,395
Recurring | Level 2 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,624 12,731
Recurring | Level 2 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 10,757 11,889
Recurring | Level 3    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 21,109 20,814
Available-for-sale Securities, Equity Securities 604 432
Fair Value Option And Trading Securities 287 270
Short-term investments 47 291
Mortgage loans at estimated fair value 566 314
Other investments 0 0
Derivative assets 419 397
Net embedded derivatives within asset host contracts 380 391
Separate account assets 1,159 1,704
Total assets 24,571 24,613
Liabilities [Abstract]    
Derivative liabilities 1,935 808
Net embedded derivatives within liability host contracts 4,105 935
Trading liabilities 0 0
Separate account liabilities 7 0
Total liabilities 6,047 1,743
Recurring | Level 3 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 2 25
Liabilities [Abstract]    
Derivative liabilities 1,111 0
Recurring | Level 3 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 80 16
Liabilities [Abstract]    
Derivative liabilities 54 148
Recurring | Level 3 | Credit contracts    
Assets [Abstract]    
Derivative assets 38 7
Liabilities [Abstract]    
Derivative liabilities 0 2
Recurring | Level 3 | Equity market contracts    
Assets [Abstract]    
Derivative assets 299 349
Liabilities [Abstract]    
Derivative liabilities 770 658
Recurring | Level 3 | Residential Mortgage Loans - FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 566 314
Recurring | Level 3 | Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 0 0
Recurring | Level 3 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 7,214 7,036
Recurring | Level 3 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 3 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 290 856
Recurring | Level 3 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,713 5,760
Recurring | Level 3 | RMBS (1)    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 5,097 4,709
Recurring | Level 3 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 27 46
Recurring | Level 3 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,253 1,663
Recurring | Level 3 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 515 $ 744