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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 351,353 $ 365,425
Available-for-sale Securities, Equity Securities 3,677 3,631
Actively Traded securities 603 704
Fair Value Option And Trading Securities 16,460 16,689
Short-term investments 14,594 8,621
Mortgage loans at estimated fair value 64,010 60,118
Derivative assets 12,494 13,452
Net embedded derivatives within asset host contracts 80 160
Separate account assets 319,477 316,994
Liabilities [Abstract]    
Derivative liabilities 6,928 7,022
Net embedded derivatives within liability host contracts (494) (46)
Long-term debt, at estimated fair value, relating to variable interest entities 16,770 16,286
Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 345 308
Consolidated Securitization Entities    
Assets [Abstract]    
Mortgage loans at estimated fair value 266 280
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 134 151
Recurring    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 351,353 365,425
Available-for-sale Securities, Equity Securities 3,677 3,631
Actively Traded securities 654 654
Fair Value Option And Trading Securities 16,460 16,689
Short-term investments 12,779 7,663
Mortgage loans at estimated fair value 611 588
Other investments 222 264
Derivative assets 12,494 13,452
Total other invested assets 12,716 13,716
Net embedded derivatives within asset host contracts 342 377
Separate account assets 319,477 316,994
Total assets 717,415 725,083
Liabilities [Abstract]    
Derivative liabilities 6,928 7,022
Net embedded derivatives within liability host contracts (494) (46)
Trading liabilities 231 239
Total liabilities 6,799 7,366
Recurring | Interest rate contracts    
Assets [Abstract]    
Derivative assets 7,854 9,055
Liabilities [Abstract]    
Derivative liabilities 2,053 2,356
Recurring | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,615 2,499
Liabilities [Abstract]    
Derivative liabilities 2,990 2,848
Recurring | Credit contracts    
Assets [Abstract]    
Derivative assets 175 189
Liabilities [Abstract]    
Derivative liabilities 44 40
Recurring | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,850 1,709
Liabilities [Abstract]    
Derivative liabilities 1,841 1,778
Recurring | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 603 704
Recurring | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 15,189 15,316
Recurring | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 345 308
Recurring | Consolidated Securitization Entities    
Assets [Abstract]    
Fair Value Option And Trading Securities 14 15
Mortgage loans at estimated fair value 266 280
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 134 151
Recurring | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 101,146 105,954
Recurring | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 59,098 61,675
Recurring | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 51,057 52,666
Recurring | U.S. Treasury and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 57,538 61,516
Recurring | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 41,518 39,846
Recurring | CMBS (1)    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,842 14,332
Recurring | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 13,990 14,249
Recurring | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 15,164 15,187
Recurring | Common stock    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 2,589 2,516
Recurring | Non-redeemable preferred stock    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 1,088 1,115
Recurring | Level 1    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 35,430 36,879
Available-for-sale Securities, Equity Securities 1,514 1,558
Actively Traded securities 0 22
Fair Value Option And Trading Securities 11,710 11,638
Short-term investments 2,453 2,104
Mortgage loans at estimated fair value 0 0
Other investments 166 203
Derivative assets 57 71
Total other invested assets 223 274
Net embedded derivatives within asset host contracts 0 0
Separate account assets 84,287 83,533
Total assets 135,617 135,986
Liabilities [Abstract]    
Derivative liabilities 27 11
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 207 215
Total liabilities 234 226
Recurring | Level 1 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 9 4
Liabilities [Abstract]    
Derivative liabilities 12 9
Recurring | Level 1 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 1 2
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 47 65
Liabilities [Abstract]    
Derivative liabilities 15 2
Recurring | Level 1 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 480 552
Recurring | Level 1 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 11,230 11,064
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 | 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 | U.S. Treasury and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 32,795 36,879
Recurring | Level 1 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 2,635 0
Recurring | Level 1 | CMBS (1)    
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 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring | Level 1 | Common stock    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 1,514 1,558
Recurring | Level 1 | Non-redeemable preferred stock    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 0 0
Recurring | Level 2    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 293,939 306,411
Available-for-sale Securities, Equity Securities 1,674 1,728
Actively Traded securities 641 627
Fair Value Option And Trading Securities 4,275 4,484
Short-term investments 8,517 5,223
Mortgage loans at estimated fair value 266 280
Other investments 56 61
Derivative assets 11,962 12,922
Total other invested assets 12,018 12,983
Net embedded derivatives within asset host contracts 0 0
Separate account assets 233,265 231,539
Total assets 553,954 562,648
Liabilities [Abstract]    
Derivative liabilities 6,054 6,252
Net embedded derivatives within liability host contracts 5 7
Trading liabilities 20 24
Total liabilities 6,201 6,421
Recurring | Level 2 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 7,826 8,988
Liabilities [Abstract]    
Derivative liabilities 2,040 2,347
Recurring | Level 2 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 2,588 2,472
Liabilities [Abstract]    
Derivative liabilities 2,888 2,755
Recurring | Level 2 | Credit contracts    
Assets [Abstract]    
Derivative assets 165 175
Liabilities [Abstract]    
Derivative liabilities 43 38
Recurring | Level 2 | Equity market contracts    
Assets [Abstract]    
Derivative assets 1,383 1,287
Liabilities [Abstract]    
Derivative liabilities 1,083 1,112
Recurring | Level 2 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 35 57
Recurring | Level 2 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 3,595 3,797
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 4 3
Mortgage loans at estimated fair value 266 280
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 122 138
Recurring | Level 2 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 94,013 99,012
Recurring | Level 2 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 52,711 55,185
Recurring | Level 2 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 49,721 51,355
Recurring | Level 2 | U.S. Treasury and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 24,688 24,637
Recurring | Level 2 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 34,747 35,463
Recurring | Level 2 | CMBS (1)    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,113 13,567
Recurring | Level 2 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,837 12,005
Recurring | Level 2 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 15,109 15,187
Recurring | Level 2 | Common stock    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 918 863
Recurring | Level 2 | Non-redeemable preferred stock    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 756 865
Recurring | Level 3    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 21,984 22,135
Available-for-sale Securities, Equity Securities 489 345
Actively Traded securities 13 5
Fair Value Option And Trading Securities 475 567
Short-term investments 1,809 336
Mortgage loans at estimated fair value 345 308
Other investments 0 0
Derivative assets 475 459
Total other invested assets 475 459
Net embedded derivatives within asset host contracts 342 377
Separate account assets 1,925 1,922
Total assets 27,844 26,449
Liabilities [Abstract]    
Derivative liabilities 847 759
Net embedded derivatives within liability host contracts (499) (53)
Trading liabilities 4 0
Total liabilities 364 719
Recurring | Level 3 | Interest rate contracts    
Assets [Abstract]    
Derivative assets 19 63
Liabilities [Abstract]    
Derivative liabilities 1 0
Recurring | Level 3 | Foreign currency exchange rate contracts    
Assets [Abstract]    
Derivative assets 26 25
Liabilities [Abstract]    
Derivative liabilities 102 93
Recurring | Level 3 | Credit contracts    
Assets [Abstract]    
Derivative assets 10 14
Liabilities [Abstract]    
Derivative liabilities 1 2
Recurring | Level 3 | Equity market contracts    
Assets [Abstract]    
Derivative assets 420 357
Liabilities [Abstract]    
Derivative liabilities 743 664
Recurring | Level 3 | FVO general account securities    
Assets [Abstract]    
Fair Value Option And Trading Securities 88 95
Recurring | Level 3 | FVO contractholder-directed unit-linked investments    
Assets [Abstract]    
Fair Value Option And Trading Securities 364 455
Recurring | Level 3 | Residential mortgage loans — FVO    
Assets [Abstract]    
Mortgage loans at estimated fair value 345 308
Recurring | Level 3 | Consolidated Securitization Entities    
Assets [Abstract]    
Fair Value Option And Trading Securities 10 12
Mortgage loans at estimated fair value 0 0
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 12 13
Recurring | Level 3 | U.S. corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 7,133 6,942
Recurring | Level 3 | Foreign corporate    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,387 6,490
Recurring | Level 3 | Foreign government    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,336 1,311
Recurring | Level 3 | U.S. Treasury and agency    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 55 0
Recurring | Level 3 | RMBS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 4,136 4,383
Recurring | Level 3 | CMBS (1)    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 729 765
Recurring | Level 3 | ABS    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 2,153 2,244
Recurring | Level 3 | State and political subdivision    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 55 0
Recurring | Level 3 | Common stock    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 157 95
Recurring | Level 3 | Non-redeemable preferred stock    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities $ 332 $ 250