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Fair Value (Recurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 348,787 $ 374,266
Available-for-sale Securities, Equity Securities 3,241 2,891
Actively Traded Securities 636 659
Fair Value Option And Trading Securities 16,646 16,348
Short-term investments 12,664 16,906
Mortgage loans, at estimated fair value, relating to variable interest entities 57,508 56,592
Mortgage loans held-for-sale 225 414
Derivative assets 9,301 13,777
Net embedded derivatives within asset host contracts 186 418
Separate account assets 255,250 235,393
Liabilities [Abstract]    
Derivative liabilities 5,558 5,536
Net embedded derivatives within liability host contracts 382 3,684
Long-term debt, at estimated fair value, relating to variable interest entities 18,252 19,062
Mortgage Loans Held-for-sale [Member]
    
Assets [Abstract]    
Mortgage loans held-for-sale 0 49
Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Mortgage loans, at estimated fair value, relating to variable interest entities 2,096 2,666
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 1,946 2,527
Recurring [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 348,787 374,266
Available-for-sale Securities, Equity Securities 3,241 2,891
Actively Traded Securities 636 659
Fair Value Option And Trading Securities 16,646 16,348
Short-term investments 10,606 16,150
Residential mortgage loans - FVO 212 0
Total mortgage loans 2,308 2,715
Other investments 239 426
Total other invested assets 9,540 14,203
Derivative assets 9,301 13,777
Net embedded derivatives within asset host contracts 322 506
Separate account assets 255,250 235,393
Total assets 646,700 662,472
Liabilities [Abstract]    
Derivative liabilities 5,558 5,536
Net embedded derivatives within liability host contracts 382 3,684
Trading liabilities 232 163
Total liabilities 8,118 11,910
Recurring [Member] | Interest rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 6,273 9,855
Liabilities [Abstract]    
Derivative liabilities 2,483 3,068
Recurring [Member] | Foreign currency exchange rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 1,022 867
Liabilities [Abstract]    
Derivative liabilities 1,558 1,528
Recurring [Member] | Credit contracts [Member]
    
Assets [Abstract]    
Derivative assets 129 90
Liabilities [Abstract]    
Derivative liabilities 40 39
Recurring [Member] | Equity market contracts [Member]
    
Assets [Abstract]    
Derivative assets 1,877 2,965
Liabilities [Abstract]    
Derivative liabilities 1,477 901
Recurring [Member] | FVO general account securities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 191 183
Recurring [Member] | FVO contractholder-directed unit-linked investments [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 15,796 15,465
Recurring [Member] | Mortgage Loans Held-for-sale [Member]
    
Assets [Abstract]    
Mortgage loans held-for-sale 0 49
Recurring [Member] | Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 23 41
Mortgage loans, at estimated fair value, relating to variable interest entities 2,096 2,666
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 1,946 2,527
Recurring [Member] | U.S. corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 107,491 114,126
Recurring [Member] | Foreign corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 63,648 67,184
Recurring [Member] | Foreign government debt securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 53,004 57,336
Recurring [Member] | U.S. Treasury and agency securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 44,154 47,967
Recurring [Member] | RMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 35,478 37,479
Recurring [Member] | CMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16,896 19,129
Recurring [Member] | ABS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 14,161 15,997
Recurring [Member] | State and political subdivision securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 13,955 15,048
Recurring [Member] | Common Stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 2,270 2,162
Recurring [Member] | Non-redeemable preferred stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 971 729
Recurring [Member] | Level 1 [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 24,117 27,441
Available-for-sale Securities, Equity Securities 1,102 932
Actively Traded Securities 4 7
Fair Value Option And Trading Securities 10,311 9,110
Short-term investments 3,615 9,426
Residential mortgage loans - FVO 0 0
Total mortgage loans 0 0
Other investments 161 303
Total other invested assets 196 322
Derivative assets 35 19
Net embedded derivatives within asset host contracts 0 0
Separate account assets 35,689 31,620
Total assets 75,030 78,851
Liabilities [Abstract]    
Derivative liabilities 11 170
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 228 163
Total liabilities 239 333
Recurring [Member] | Level 1 [Member] | Interest rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 3 1
Liabilities [Abstract]    
Derivative liabilities 7 38
Recurring [Member] | Level 1 [Member] | Foreign currency exchange rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 2 4
Liabilities [Abstract]    
Derivative liabilities 0 0
Recurring [Member] | Level 1 [Member] | Credit contracts [Member]
    
Assets [Abstract]    
Derivative assets 0 0
Liabilities [Abstract]    
Derivative liabilities 0 0
Recurring [Member] | Level 1 [Member] | Equity market contracts [Member]
    
Assets [Abstract]    
Derivative assets 30 14
Liabilities [Abstract]    
Derivative liabilities 4 132
Recurring [Member] | Level 1 [Member] | FVO general account securities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 5 0
Recurring [Member] | Level 1 [Member] | FVO contractholder-directed unit-linked investments [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 10,302 9,103
Recurring [Member] | Level 1 [Member] | Mortgage Loans Held-for-sale [Member]
    
Assets [Abstract]    
Mortgage loans held-for-sale 0 0
Recurring [Member] | Level 1 [Member] | Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 0 0
Mortgage loans, at estimated fair value, relating to variable interest entities 0 0
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 0 0
Recurring [Member] | Level 1 [Member] | U.S. corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring [Member] | Level 1 [Member] | Foreign corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring [Member] | Level 1 [Member] | Foreign government debt securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring [Member] | Level 1 [Member] | U.S. Treasury and agency securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 23,460 27,441
Recurring [Member] | Level 1 [Member] | RMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 657 0
Recurring [Member] | Level 1 [Member] | CMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring [Member] | Level 1 [Member] | ABS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring [Member] | Level 1 [Member] | State and political subdivision securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 0 0
Recurring [Member] | Level 1 [Member] | Common Stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 1,102 932
Recurring [Member] | Level 1 [Member] | Non-redeemable preferred stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 0 0
Recurring [Member] | Level 2 [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 302,119 324,405
Available-for-sale Securities, Equity Securities 1,549 1,350
Actively Traded Securities 621 646
Fair Value Option And Trading Securities 5,671 6,263
Short-term investments 6,799 6,295
Residential mortgage loans - FVO 0 0
Total mortgage loans 2,096 2,666
Other investments 78 123
Total other invested assets 8,920 13,115
Derivative assets 8,842 12,992
Net embedded derivatives within asset host contracts 0 1
Separate account assets 218,144 202,568
Total assets 545,298 556,663
Liabilities [Abstract]    
Derivative liabilities 4,957 4,985
Net embedded derivatives within liability host contracts 7 17
Trading liabilities 4 0
Total liabilities 6,888 7,485
Recurring [Member] | Level 2 [Member] | Interest rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 6,206 9,648
Liabilities [Abstract]    
Derivative liabilities 2,457 3,001
Recurring [Member] | Level 2 [Member] | Foreign currency exchange rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 995 819
Liabilities [Abstract]    
Derivative liabilities 1,542 1,521
Recurring [Member] | Level 2 [Member] | Credit contracts [Member]
    
Assets [Abstract]    
Derivative assets 98 47
Liabilities [Abstract]    
Derivative liabilities 40 39
Recurring [Member] | Level 2 [Member] | Equity market contracts [Member]
    
Assets [Abstract]    
Derivative assets 1,543 2,478
Liabilities [Abstract]    
Derivative liabilities 918 424
Recurring [Member] | Level 2 [Member] | FVO general account securities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 139 151
Recurring [Member] | Level 2 [Member] | FVO contractholder-directed unit-linked investments [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 4,888 5,425
Recurring [Member] | Level 2 [Member] | Mortgage Loans Held-for-sale [Member]
    
Assets [Abstract]    
Mortgage loans held-for-sale 0 0
Recurring [Member] | Level 2 [Member] | Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 23 41
Mortgage loans, at estimated fair value, relating to variable interest entities 2,096 2,666
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 1,920 2,483
Recurring [Member] | Level 2 [Member] | U.S. corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 101,605 106,693
Recurring [Member] | Level 2 [Member] | Foreign corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 57,384 60,976
Recurring [Member] | Level 2 [Member] | Foreign government debt securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 50,941 55,522
Recurring [Member] | Level 2 [Member] | U.S. Treasury and agency securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 20,629 20,455
Recurring [Member] | Level 2 [Member] | RMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 31,803 35,442
Recurring [Member] | Level 2 [Member] | CMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 15,720 17,982
Recurring [Member] | Level 2 [Member] | ABS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 10,098 12,341
Recurring [Member] | Level 2 [Member] | State and political subdivision securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 13,939 14,994
Recurring [Member] | Level 2 [Member] | Common Stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 983 1,040
Recurring [Member] | Level 2 [Member] | Non-redeemable preferred stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 566 310
Recurring [Member] | Level 3 [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 22,551 22,420
Available-for-sale Securities, Equity Securities 590 609
Actively Traded Securities 11 6
Fair Value Option And Trading Securities 664 975
Short-term investments 192 429
Residential mortgage loans - FVO 212 0
Total mortgage loans 212 49
Other investments 0 0
Total other invested assets 424 766
Derivative assets 424 766
Net embedded derivatives within asset host contracts 322 505
Separate account assets 1,417 1,205
Total assets 26,372 26,958
Liabilities [Abstract]    
Derivative liabilities 590 381
Net embedded derivatives within liability host contracts 375 3,667
Trading liabilities 0 0
Total liabilities 991 4,092
Recurring [Member] | Level 3 [Member] | Interest rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 64 206
Liabilities [Abstract]    
Derivative liabilities 19 29
Recurring [Member] | Level 3 [Member] | Foreign currency exchange rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 25 44
Liabilities [Abstract]    
Derivative liabilities 16 7
Recurring [Member] | Level 3 [Member] | Credit contracts [Member]
    
Assets [Abstract]    
Derivative assets 31 43
Liabilities [Abstract]    
Derivative liabilities 0 0
Recurring [Member] | Level 3 [Member] | Equity market contracts [Member]
    
Assets [Abstract]    
Derivative assets 304 473
Liabilities [Abstract]    
Derivative liabilities 555 345
Recurring [Member] | Level 3 [Member] | FVO general account securities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 47 32
Recurring [Member] | Level 3 [Member] | FVO contractholder-directed unit-linked investments [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 606 937
Recurring [Member] | Level 3 [Member] | Mortgage Loans Held-for-sale [Member]
    
Assets [Abstract]    
Mortgage loans held-for-sale 0 49
Recurring [Member] | Level 3 [Member] | Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 0 0
Mortgage loans, at estimated fair value, relating to variable interest entities 0 0
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 26 44
Recurring [Member] | Level 3 [Member] | U.S. corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 5,886 7,433
Recurring [Member] | Level 3 [Member] | Foreign corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,264 6,208
Recurring [Member] | Level 3 [Member] | Foreign government debt securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 2,063 1,814
Recurring [Member] | Level 3 [Member] | U.S. Treasury and agency securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 65 71
Recurring [Member] | Level 3 [Member] | RMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 3,018 2,037
Recurring [Member] | Level 3 [Member] | CMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,176 1,147
Recurring [Member] | Level 3 [Member] | ABS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 4,063 3,656
Recurring [Member] | Level 3 [Member] | State and political subdivision securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 16 54
Recurring [Member] | Level 3 [Member] | Common Stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 185 190
Recurring [Member] | Level 3 [Member] | Non-redeemable preferred stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities $ 405 $ 419