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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 371,981 $ 351,402
Available-for-sale Securities, Equity Securities 3,374 3,321
Actively traded securities 360 404
Fair Value Option And Trading Securities 14,993 15,024
Short-term investments 11,621 9,299
Mortgage loans at estimated fair value 68,651 67,102
Derivative assets 18,747 14,406
Net embedded derivatives within asset host contracts 286 171
Separate account assets 306,047 301,598
Liabilities [Abstract]    
Derivative liabilities 8,122 7,049
Net embedded derivatives within liability host contracts 2,427 935
Long-term debt, at estimated fair value, relating to variable interest entities 17,915 18,023
Separate account liabilities 306,047 301,598
Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 392 314
Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 169 172
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 55 60
Recurring    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 371,981 351,402
Available-for-sale Securities, Equity Securities 3,374 3,321
Actively traded securities 360 404
Fair Value Option And Trading Securities 14,993 15,024
Short-term investments 10,766 8,819
Mortgage loans at estimated fair value 561 486
Other investments 150 162
Derivative assets 18,747 14,406
Total other invested assets 18,897 14,568
Net embedded derivatives within asset host contracts 488 391
Separate account assets 306,047 301,598
Total assets 727,107 695,609
Liabilities [Abstract]    
Derivative liabilities 8,122 7,049
Net embedded derivatives within liability host contracts 2,427 935
Trading liabilities 160 153
Total liabilities 10,859 8,197
Recurring | Interest rate contracts    
Assets [Abstract]    
Derivative assets 13,326 9,434
Liabilities [Abstract]    
Derivative liabilities 3,297 2,347
Recurring | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 3,126 3,019
Liabilities [Abstract]    
Derivative liabilities 2,625 2,902
Recurring | Credit contracts    
Assets [Abstract]    
Derivative assets 127 106
Liabilities [Abstract]    
Derivative liabilities 33 47
Recurring | Equity market contracts    
Assets [Abstract]    
Derivative assets 2,168 1,847
Liabilities [Abstract]    
Derivative liabilities 2,167 1,753
Recurring | Derivative Liabilities Within Separate Accounts    
Liabilities [Abstract]    
Separate account liabilities 95 0
Recurring | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 741 627
Recurring | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 13,882 13,981
Recurring | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 392 314
Recurring | Consolidated Securitization Entities    
Assets [Abstract]    
Fair Value Option And Trading Securities 10 12
Mortgage loans at estimated fair value 169 172
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 55 60
Recurring | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 102,096 100,794
Recurring | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 64,991 61,646
Recurring | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 59,091 57,198
Recurring | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 56,656 50,499
Recurring | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 43,029 38,797
Recurring | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,539 15,441
Recurring | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,202 14,394
Recurring | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 13,377 12,633
Recurring | Level 1    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 41,685 37,660
Available-for-sale Securities, Equity Securities 1,417 1,274
Actively traded securities 98 0
Fair Value Option And Trading Securities 11,644 11,335
Short-term investments 2,263 2,543
Mortgage loans at estimated fair value 0 0
Other investments 96 109
Derivative assets 50 67
Total other invested assets 146 176
Net embedded derivatives within asset host contracts 0 0
Separate account assets 82,055 77,080
Total assets 139,210 130,068
Liabilities [Abstract]    
Derivative liabilities 23 25
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 111 103
Total liabilities 134 128
Recurring | Level 1 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 21 4
Liabilities [Abstract]    
Derivative liabilities 7 7
Recurring | Level 1 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 1 0
Liabilities [Abstract]    
Derivative liabilities 1 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 28 63
Liabilities [Abstract]    
Derivative liabilities 15 18
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts    
Liabilities [Abstract]    
Separate account liabilities 0 0
Recurring | Level 1 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 610 506
Recurring | Level 1 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 10,936 10,829
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]    
Fair Value Option And Trading Securities 0 0
Mortgage loans at estimated fair value 0 0
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 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 37,984 37,660
Recurring | Level 1 | Foreign 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 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 3,701 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 309,893 292,928
Available-for-sale Securities, Equity Securities 1,288 1,615
Actively traded securities 259 400
Fair Value Option And Trading Securities 3,100 3,419
Short-term investments 8,333 5,985
Mortgage loans at estimated fair value 169 172
Other investments 54 53
Derivative assets 18,254 13,942
Total other invested assets 18,308 13,995
Net embedded derivatives within asset host contracts 0 0
Separate account assets 222,518 222,814
Total assets 563,609 540,928
Liabilities [Abstract]    
Derivative liabilities 7,318 6,216
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 49 50
Total liabilities 7,497 6,315
Recurring | Level 2 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 13,288 9,405
Liabilities [Abstract]    
Derivative liabilities 3,289 2,340
Recurring | Level 2 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 3,087 3,003
Liabilities [Abstract]    
Derivative liabilities 2,548 2,754
Recurring | Level 2 | Credit contracts    
Assets [Abstract]    
Derivative assets 110 99
Liabilities [Abstract]    
Derivative liabilities 33 45
Recurring | Level 2 | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,769 1,435
Liabilities [Abstract]    
Derivative liabilities 1,448 1,077
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts    
Liabilities [Abstract]    
Separate account liabilities 87 0
Recurring | Level 2 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 33 32
Recurring | Level 2 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 2,806 2,985
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]    
Fair Value Option And Trading Securities 2 2
Mortgage loans at estimated fair value 169 172
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 43 49
Recurring | Level 2 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 95,388 93,758
Recurring | Level 2 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 26,796 23,986
Recurring | Level 2 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 53,007 51,438
Recurring | Level 2 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 55,944 49,643
Recurring | Level 2 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 34,327 34,088
Recurring | Level 2 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,503 15,395
Recurring | Level 2 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 15,263 12,731
Recurring | Level 2 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,665 11,889
Recurring | Level 3    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 20,403 20,814
Available-for-sale Securities, Equity Securities 669 432
Actively traded securities 3 4
Fair Value Option And Trading Securities 249 270
Short-term investments 170 291
Mortgage loans at estimated fair value 392 314
Other investments 0 0
Derivative assets 443 397
Total other invested assets 443 397
Net embedded derivatives within asset host contracts 488 391
Separate account assets 1,474 1,704
Total assets 24,288 24,613
Liabilities [Abstract]    
Derivative liabilities 781 808
Net embedded derivatives within liability host contracts 2,427 935
Trading liabilities 0 0
Total liabilities 3,228 1,754
Recurring | Level 3 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 17 25
Liabilities [Abstract]    
Derivative liabilities 1 0
Recurring | Level 3 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 38 16
Liabilities [Abstract]    
Derivative liabilities 76 148
Recurring | Level 3 | Credit contracts    
Assets [Abstract]    
Derivative assets 17 7
Liabilities [Abstract]    
Derivative liabilities 0 2
Recurring | Level 3 | Equity market contracts    
Assets [Abstract]    
Derivative assets 371 349
Liabilities [Abstract]    
Derivative liabilities 704 658
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts    
Liabilities [Abstract]    
Separate account liabilities 8 0
Recurring | Level 3 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 98 89
Recurring | Level 3 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 140 167
Recurring | Level 3 | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 392 314
Recurring | Level 3 | Consolidated Securitization Entities    
Assets [Abstract]    
Fair Value Option And Trading Securities 8 10
Mortgage loans at estimated fair value 0 0
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 12 11
Recurring | Level 3 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,708 7,036
Recurring | Level 3 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 211 0
Recurring | Level 3 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,084 5,760
Recurring | Level 3 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 712 856
Recurring | Level 3 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 5,001 4,709
Recurring | Level 3 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 36 46
Recurring | Level 3 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 939 1,663
Recurring | Level 3 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 712 $ 744