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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 364,084 $ 350,889
Available-for-sale Securities, Equity Securities 3,415 3,194
Fair Value Option And Trading Securities 14,762 13,923
Short-term investments 7,177 7,810
Mortgage loans at estimated fair value 77,572 74,545
Derivative assets 12,178 15,761
Embedded derivatives within asset host contracts 169 243
Separate account assets 320,455 308,620
Liabilities [Abstract]    
Derivative liabilities 8,217 10,804
Embedded derivatives within liability host contracts 3,889 4,105
Separate account liabilities 320,455 308,620
Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 615 566
Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 123 136
Recurring    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 364,084 350,889
Available-for-sale Securities, Equity Securities 3,415 3,194
Fair Value Option And Trading Securities 14,762 13,923
Short-term investments 6,597 7,291
Mortgage loans at estimated fair value 738 702
Other investments 181 157
Derivative assets 12,178 15,761
Embedded derivatives within asset host contracts 388 380
Separate account assets 320,455 308,620
Total assets 722,798 700,917
Liabilities [Abstract]    
Derivative liabilities 8,217 10,804
Embedded derivatives within liability host contracts 3,889 4,105
Total liabilities 12,123 14,932
Recurring | Interest rate contracts    
Assets [Abstract]    
Derivative assets 7,133 9,713
Liabilities [Abstract]    
Derivative liabilities 2,171 4,525
Recurring | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,954 4,229
Liabilities [Abstract]    
Derivative liabilities 3,029 3,853
Recurring | Credit contracts    
Assets [Abstract]    
Derivative assets 267 203
Liabilities [Abstract]    
Derivative liabilities 46 49
Recurring | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,824 1,616
Liabilities [Abstract]    
Derivative liabilities 2,971 2,377
Recurring | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 17 23
Recurring | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 615 566
Recurring | Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 123 136
Recurring | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 102,599 100,853
Recurring | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 59,879 57,523
Recurring | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 61,108 57,138
Recurring | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 60,474 57,057
Recurring | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 38,532 36,993
Recurring | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,254 16,176
Recurring | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 14,135 13,877
Recurring | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,103 11,272
Recurring | Level 1    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 31,690 31,153
Available-for-sale Securities, Equity Securities 1,640 1,373
Fair Value Option And Trading Securities 12,118 11,123
Short-term investments 3,213 4,808
Mortgage loans at estimated fair value 0 0
Other investments 80 86
Derivative assets 36 80
Embedded derivatives within asset host contracts 0 0
Separate account assets 88,537 83,538
Total assets 137,314 132,161
Liabilities [Abstract]    
Derivative liabilities 9 15
Embedded derivatives within liability host contracts 0 0
Total liabilities 9 15
Recurring | Level 1 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 24 12
Liabilities [Abstract]    
Derivative liabilities 2 12
Recurring | Level 1 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 0 0
Liabilities [Abstract]    
Derivative liabilities 4 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 12 68
Liabilities [Abstract]    
Derivative liabilities 3 3
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 0 0
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 31,342 31,153
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    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 348 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 311,781 298,627
Available-for-sale Securities, Equity Securities 1,174 1,217
Fair Value Option And Trading Securities 2,332 2,513
Short-term investments 2,471 2,436
Mortgage loans at estimated fair value 123 136
Other investments 101 71
Derivative assets 11,686 15,262
Embedded derivatives within asset host contracts 0 0
Separate account assets 230,947 223,923
Total assets 560,615 544,185
Liabilities [Abstract]    
Derivative liabilities 6,684 8,854
Embedded derivatives within liability host contracts 0 0
Total liabilities 6,695 8,870
Recurring | Level 2 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 7,083 9,699
Liabilities [Abstract]    
Derivative liabilities 1,570 3,402
Recurring | Level 2 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,881 4,149
Liabilities [Abstract]    
Derivative liabilities 2,973 3,799
Recurring | Level 2 | Credit contracts    
Assets [Abstract]    
Derivative assets 220 165
Liabilities [Abstract]    
Derivative liabilities 46 49
Recurring | Level 2 | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,502 1,249
Liabilities [Abstract]    
Derivative liabilities 2,095 1,604
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 11 16
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 123 136
Recurring | Level 2 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 95,628 93,639
Recurring | Level 2 | U.S. government and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 28,537 26,370
Recurring | Level 2 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 60,900 56,848
Recurring | Level 2 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 53,457 50,344
Recurring | Level 2 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 33,354 31,896
Recurring | Level 2 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,254 16,149
Recurring | Level 2 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 13,096 12,624
Recurring | Level 2 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 10,555 10,757
Recurring | Level 3    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 20,613 21,109
Available-for-sale Securities, Equity Securities 601 604
Fair Value Option And Trading Securities 312 287
Short-term investments 913 47
Mortgage loans at estimated fair value 615 566
Other investments 0 0
Derivative assets 456 419
Embedded derivatives within asset host contracts 388 380
Separate account assets 971 1,159
Total assets 24,869 24,571
Liabilities [Abstract]    
Derivative liabilities 1,524 1,935
Embedded derivatives within liability host contracts 3,889 4,105
Total liabilities 5,419 6,047
Recurring | Level 3 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 26 2
Liabilities [Abstract]    
Derivative liabilities 599 1,111
Recurring | Level 3 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 73 80
Liabilities [Abstract]    
Derivative liabilities 52 54
Recurring | Level 3 | Credit contracts    
Assets [Abstract]    
Derivative assets 47 38
Liabilities [Abstract]    
Derivative liabilities 0 0
Recurring | Level 3 | Equity market contracts    
Assets [Abstract]    
Derivative assets 310 299
Liabilities [Abstract]    
Derivative liabilities 873 770
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts [Member]    
Liabilities [Abstract]    
Separate account liabilities 6 7
Recurring | Level 3 | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 615 566
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 6,971 7,214
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 208 290
Recurring | Level 3 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 7,017 6,713
Recurring | Level 3 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 4,830 5,097
Recurring | Level 3 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 27
Recurring | Level 3 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,039 1,253
Recurring | Level 3 | CMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 548 $ 515