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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 390,442 $ 351,402
Available-for-sale Securities, Equity Securities 3,289 3,321
Actively traded securities 0 404
Fair Value Option And Trading Securities 14,730 15,024
Short-term investments 11,655 9,299
Mortgage loans at estimated fair value 71,156 67,102
Derivative assets 21,788 14,406
Net embedded derivatives within asset host contracts 338 171
Separate account assets 315,648 301,598
Liabilities [Abstract]    
Derivative liabilities 8,352 7,049
Net embedded derivatives within liability host contracts 6,883 935
Long-term debt, at estimated fair value, relating to variable interest entities 16,553 18,023
Separate account liabilities 315,648 301,598
Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 481 314
Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 143 172
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 38 60
Recurring    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 390,442 351,402
Available-for-sale Securities, Equity Securities 3,289 3,321
Actively traded securities 0 404
Fair Value Option And Trading Securities 14,730 15,024
Short-term investments 10,544 8,819
Mortgage loans at estimated fair value 624 486
Other investments 155 162
Derivative assets 21,788 14,406
Net embedded derivatives within asset host contracts 578 391
Separate account assets 315,648 301,598
Total assets 757,798 695,609
Liabilities [Abstract]    
Derivative liabilities 8,352 7,049
Net embedded derivatives within liability host contracts 6,883 935
Trading liabilities 0 153
Total liabilities 15,355 8,197
Recurring | Interest rate contracts    
Assets [Abstract]    
Derivative assets 15,432 9,434
Liabilities [Abstract]    
Derivative liabilities 3,172 2,347
Recurring | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 4,431 3,019
Liabilities [Abstract]    
Derivative liabilities 2,849 2,902
Recurring | Credit contracts    
Assets [Abstract]    
Derivative assets 160 106
Liabilities [Abstract]    
Derivative liabilities 54 47
Recurring | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,765 1,847
Liabilities [Abstract]    
Derivative liabilities 2,277 1,753
Recurring | Derivative Liabilities Within Separate Accounts    
Liabilities [Abstract]    
Separate account liabilities 82 0
Recurring | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 721 627
Recurring | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 14,000 13,981
Recurring | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 481 314
Recurring | Consolidated Securitization Entities    
Assets [Abstract]    
Fair Value Option And Trading Securities 9 12
Mortgage loans at estimated fair value 143 172
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 38 60
Recurring | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 105,676 100,794
Recurring | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 69,785 61,646
Recurring | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 60,419 57,198
Recurring | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 63,765 50,499
Recurring | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 45,309 38,797
Recurring | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 17,463 15,441
Recurring | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 15,584 14,394
Recurring | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 12,441 12,633
Recurring | Level 1    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 45,129 37,660
Available-for-sale Securities, Equity Securities 1,364 1,274
Actively traded securities 0 0
Fair Value Option And Trading Securities 11,639 11,335
Short-term investments 5,561 2,543
Mortgage loans at estimated fair value 0 0
Other investments 92 109
Derivative assets 18 67
Net embedded derivatives within asset host contracts 0 0
Separate account assets 87,035 77,080
Total assets 150,838 130,068
Liabilities [Abstract]    
Derivative liabilities 111 25
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 0 103
Total liabilities 112 128
Recurring | Level 1 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 4 4
Liabilities [Abstract]    
Derivative liabilities 41 7
Recurring | Level 1 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 0 0
Liabilities [Abstract]    
Derivative liabilities 2 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 14 63
Liabilities [Abstract]    
Derivative liabilities 68 18
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts    
Liabilities [Abstract]    
Separate account liabilities 1 0
Recurring | Level 1 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 578 506
Recurring | Level 1 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 11,061 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 40,780 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 4,349 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 323,709 292,928
Available-for-sale Securities, Equity Securities 1,270 1,615
Actively traded securities 0 400
Fair Value Option And Trading Securities 2,848 3,419
Short-term investments 4,310 5,985
Mortgage loans at estimated fair value 143 172
Other investments 63 53
Derivative assets 21,199 13,942
Net embedded derivatives within asset host contracts 0 0
Separate account assets 227,343 222,814
Total assets 580,885 540,928
Liabilities [Abstract]    
Derivative liabilities 7,381 6,216
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 0 50
Total liabilities 7,482 6,315
Recurring | Level 2 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 15,272 9,405
Liabilities [Abstract]    
Derivative liabilities 3,084 2,340
Recurring | Level 2 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 4,369 3,003
Liabilities [Abstract]    
Derivative liabilities 2,795 2,754
Recurring | Level 2 | Credit contracts    
Assets [Abstract]    
Derivative assets 141 99
Liabilities [Abstract]    
Derivative liabilities 54 45
Recurring | Level 2 | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,417 1,435
Liabilities [Abstract]    
Derivative liabilities 1,448 1,077
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts    
Liabilities [Abstract]    
Separate account liabilities 75 0
Recurring | Level 2 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 30 32
Recurring | Level 2 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 2,816 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 143 172
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 26 49
Recurring | Level 2 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 98,569 93,758
Recurring | Level 2 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 28,688 23,986
Recurring | Level 2 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 53,667 51,438
Recurring | Level 2 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 63,443 49,643
Recurring | Level 2 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 35,510 34,088
Recurring | Level 2 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 17,417 15,395
Recurring | Level 2 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 14,506 12,731
Recurring | Level 2 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,909 11,889
Recurring | Level 3    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 21,604 20,814
Available-for-sale Securities, Equity Securities 655 432
Actively traded securities 0 4
Fair Value Option And Trading Securities 243 270
Short-term investments 673 291
Mortgage loans at estimated fair value 481 314
Other investments 0 0
Derivative assets 571 397
Net embedded derivatives within asset host contracts 578 391
Separate account assets 1,270 1,704
Total assets 26,075 24,613
Liabilities [Abstract]    
Derivative liabilities 860 808
Net embedded derivatives within liability host contracts 6,883 935
Trading liabilities 0 0
Total liabilities 7,761 1,754
Recurring | Level 3 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 156 25
Liabilities [Abstract]    
Derivative liabilities 47 0
Recurring | Level 3 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 62 16
Liabilities [Abstract]    
Derivative liabilities 52 148
Recurring | Level 3 | Credit contracts    
Assets [Abstract]    
Derivative assets 19 7
Liabilities [Abstract]    
Derivative liabilities 0 2
Recurring | Level 3 | Equity market contracts    
Assets [Abstract]    
Derivative assets 334 349
Liabilities [Abstract]    
Derivative liabilities 761 658
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts    
Liabilities [Abstract]    
Separate account liabilities 6 0
Recurring | Level 3 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 113 89
Recurring | Level 3 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 123 167
Recurring | Level 3 | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 481 314
Recurring | Level 3 | Consolidated Securitization Entities    
Assets [Abstract]    
Fair Value Option And Trading Securities 7 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 7,107 7,036
Recurring | Level 3 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 317 0
Recurring | Level 3 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,752 5,760
Recurring | Level 3 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 322 856
Recurring | Level 3 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 5,450 4,709
Recurring | Level 3 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 46 46
Recurring | Level 3 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,078 1,663
Recurring | Level 3 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 532 $ 744