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Fair Value (Recurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets [Abstract]    
Available-for-sale Securities, Debt Securities $ 355,069 $ 350,187
Available-for-sale Securities, Equity Securities 3,693 3,402
Actively Traded Securities 628 662
Fair Value Option And Trading Securities 17,494 17,423
Short-term investments 13,908 13,955
Mortgage Loans on Real Estate 57,139 57,706
Derivative assets 9,130 8,595
Net embedded derivatives within asset host contracts 137 140
Separate account assets 316,434 317,201
Liabilities [Abstract]    
Derivative liabilities 5,745 6,521
Net embedded derivatives within liability host contracts (673) (969)
Long-term debt, at estimated fair value, relating to variable interest entities 16,793 18,653
Residential Mortgage Loans - FVO [Member]
    
Assets [Abstract]    
Mortgage Loans on Real Estate 352 338
Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Mortgage Loans on Real Estate 1,140 1,598
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 996 1,455
Recurring [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 355,069 350,187
Available-for-sale Securities, Equity Securities 3,693 3,402
Actively Traded Securities 628 662
Fair Value Option And Trading Securities 17,494 17,423
Short-term investments 12,311 13,112
Mortgage Loans on Real Estate 1,492 1,936
Other investments 227 259
Derivative assets 9,130 8,595
Total other invested assets 9,357 8,854
Net embedded derivatives within asset host contracts 301 285
Separate account assets 316,434 317,201
Total assets 716,151 712,400
Liabilities [Abstract]    
Derivative liabilities 5,745 6,521
Net embedded derivatives within liability host contracts (673) (969)
Trading liabilities 201 262
Total liabilities 6,269 7,269
Recurring [Member] | Interest rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 6,176 5,594
Liabilities [Abstract]    
Derivative liabilities 2,239 2,591
Recurring [Member] | Foreign currency exchange rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 1,227 1,309
Liabilities [Abstract]    
Derivative liabilities 1,506 2,011
Recurring [Member] | Credit contracts [Member]
    
Assets [Abstract]    
Derivative assets 153 173
Liabilities [Abstract]    
Derivative liabilities 50 52
Recurring [Member] | Equity market contracts [Member]
    
Assets [Abstract]    
Derivative assets 1,574 1,519
Liabilities [Abstract]    
Derivative liabilities 1,950 1,867
Recurring [Member] | FVO general account securities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 655 627
Recurring [Member] | FVO contractholder-directed unit-linked investments [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 16,192 16,111
Recurring [Member] | Residential Mortgage Loans - FVO [Member]
    
Assets [Abstract]    
Mortgage Loans on Real Estate 352 338
Recurring [Member] | Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 19 23
Mortgage Loans on Real Estate 1,140 1,598
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 996 1,455
Recurring [Member] | U.S. corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 109,200 106,469
Recurring [Member] | Foreign corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 64,177 63,152
Recurring [Member] | Foreign government debt securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 54,707 54,437
Recurring [Member] | U.S. Treasury and agency securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 44,809 45,123
Recurring [Member] | RMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 37,203 35,055
Recurring [Member] | CMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 15,992 16,550
Recurring [Member] | ABS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 14,653 15,571
Recurring [Member] | State and political subdivision securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 14,328 13,830
Recurring [Member] | Common Stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 2,530 2,353
Recurring [Member] | Non-redeemable preferred stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 1,163 1,049
Recurring [Member] | Level 1 [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 20,692 25,061
Available-for-sale Securities, Equity Securities 1,293 1,186
Actively Traded Securities 0 2
Fair Value Option And Trading Securities 11,471 11,222
Short-term investments 5,259 5,915
Mortgage Loans on Real Estate 0 0
Other investments 160 188
Derivative assets 6 12
Total other invested assets 166 200
Net embedded derivatives within asset host contracts 0 0
Separate account assets 87,021 89,960
Total assets 125,902 133,544
Liabilities [Abstract]    
Derivative liabilities 78 53
Net embedded derivatives within liability host contracts 0 0
Trading liabilities 40 260
Total liabilities 118 313
Recurring [Member] | Level 1 [Member] | Interest rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 2 10
Liabilities [Abstract]    
Derivative liabilities 5 9
Recurring [Member] | Level 1 [Member] | Foreign currency exchange rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 1 1
Liabilities [Abstract]    
Derivative liabilities 1 1
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 3 1
Liabilities [Abstract]    
Derivative liabilities 72 43
Recurring [Member] | Level 1 [Member] | FVO general account securities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 550 518
Recurring [Member] | Level 1 [Member] | FVO contractholder-directed unit-linked investments [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 10,921 10,702
Recurring [Member] | Level 1 [Member] | Residential Mortgage Loans - FVO [Member]
    
Assets [Abstract]    
Mortgage Loans on Real Estate 0 0
Recurring [Member] | Level 1 [Member] | Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 0 0
Mortgage Loans on Real Estate 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 19,605 25,061
Recurring [Member] | Level 1 [Member] | RMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,087 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 1,293 1,186
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 311,966 300,828
Available-for-sale Securities, Equity Securities 1,756 1,644
Actively Traded Securities 617 648
Fair Value Option And Trading Securities 5,348 5,557
Short-term investments 6,020 6,943
Mortgage Loans on Real Estate 1,140 1,598
Other investments 67 71
Derivative assets 8,686 8,214
Total other invested assets 8,753 8,285
Net embedded derivatives within asset host contracts 0 0
Separate account assets 227,683 225,776
Total assets 562,666 550,631
Liabilities [Abstract]    
Derivative liabilities 4,936 5,813
Net embedded derivatives within liability host contracts 6 4
Trading liabilities 161 2
Total liabilities 6,084 7,246
Recurring [Member] | Level 2 [Member] | Interest rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 6,110 5,557
Liabilities [Abstract]    
Derivative liabilities 2,226 2,568
Recurring [Member] | Level 2 [Member] | Foreign currency exchange rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 1,192 1,280
Liabilities [Abstract]    
Derivative liabilities 1,458 1,971
Recurring [Member] | Level 2 [Member] | Credit contracts [Member]
    
Assets [Abstract]    
Derivative assets 131 144
Liabilities [Abstract]    
Derivative liabilities 48 52
Recurring [Member] | Level 2 [Member] | Equity market contracts [Member]
    
Assets [Abstract]    
Derivative assets 1,253 1,233
Liabilities [Abstract]    
Derivative liabilities 1,204 1,222
Recurring [Member] | Level 2 [Member] | FVO general account securities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 76 80
Recurring [Member] | Level 2 [Member] | FVO contractholder-directed unit-linked investments [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 4,647 4,806
Recurring [Member] | Level 2 [Member] | Residential Mortgage Loans - FVO [Member]
    
Assets [Abstract]    
Mortgage Loans on Real Estate 0 0
Recurring [Member] | Level 2 [Member] | Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 8 23
Mortgage Loans on Real Estate 1,140 1,598
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 981 1,427
Recurring [Member] | Level 2 [Member] | U.S. corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 101,822 99,321
Recurring [Member] | Level 2 [Member] | Foreign corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 57,676 56,448
Recurring [Member] | Level 2 [Member] | Foreign government debt securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 53,162 52,202
Recurring [Member] | Level 2 [Member] | U.S. Treasury and agency securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 25,159 20,000
Recurring [Member] | Level 2 [Member] | RMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 32,677 32,098
Recurring [Member] | Level 2 [Member] | CMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 15,310 15,578
Recurring [Member] | Level 2 [Member] | ABS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 11,853 11,361
Recurring [Member] | Level 2 [Member] | State and political subdivision securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 14,307 13,820
Recurring [Member] | Level 2 [Member] | Common Stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 1,034 990
Recurring [Member] | Level 2 [Member] | Non-redeemable preferred stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 722 654
Recurring [Member] | Level 3 [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 22,411 24,298
Available-for-sale Securities, Equity Securities 644 572
Actively Traded Securities 11 12
Fair Value Option And Trading Securities 675 644
Short-term investments 1,032 254
Mortgage Loans on Real Estate 352 338
Other investments 0 0
Derivative assets 438 369
Total other invested assets 438 369
Net embedded derivatives within asset host contracts 301 285
Separate account assets 1,730 1,465
Total assets 27,583 28,225
Liabilities [Abstract]    
Derivative liabilities 731 655
Net embedded derivatives within liability host contracts (679) (973)
Trading liabilities 0 0
Total liabilities 67 (290)
Recurring [Member] | Level 3 [Member] | Interest rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 64 27
Liabilities [Abstract]    
Derivative liabilities 8 14
Recurring [Member] | Level 3 [Member] | Foreign currency exchange rate contracts [Member]
    
Assets [Abstract]    
Derivative assets 34 28
Liabilities [Abstract]    
Derivative liabilities 47 39
Recurring [Member] | Level 3 [Member] | Credit contracts [Member]
    
Assets [Abstract]    
Derivative assets 22 29
Liabilities [Abstract]    
Derivative liabilities 2 0
Recurring [Member] | Level 3 [Member] | Equity market contracts [Member]
    
Assets [Abstract]    
Derivative assets 318 285
Liabilities [Abstract]    
Derivative liabilities 674 602
Recurring [Member] | Level 3 [Member] | FVO general account securities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 29 29
Recurring [Member] | Level 3 [Member] | FVO contractholder-directed unit-linked investments [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 624 603
Recurring [Member] | Level 3 [Member] | Residential Mortgage Loans - FVO [Member]
    
Assets [Abstract]    
Mortgage Loans on Real Estate 352 338
Recurring [Member] | Level 3 [Member] | Consolidated Securitization Entities [Member]
    
Assets [Abstract]    
Fair Value Option And Trading Securities 11 0
Mortgage Loans on Real Estate 0 0
Liabilities [Abstract]    
Long-term debt, at estimated fair value, relating to variable interest entities 15 28
Recurring [Member] | Level 3 [Member] | U.S. corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 7,378 7,148
Recurring [Member] | Level 3 [Member] | Foreign corporate securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 6,501 6,704
Recurring [Member] | Level 3 [Member] | Foreign government debt securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 1,545 2,235
Recurring [Member] | Level 3 [Member] | U.S. Treasury and agency securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 45 62
Recurring [Member] | Level 3 [Member] | RMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 3,439 2,957
Recurring [Member] | Level 3 [Member] | CMBS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 682 972
Recurring [Member] | Level 3 [Member] | ABS [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 2,800 4,210
Recurring [Member] | Level 3 [Member] | State and political subdivision securities [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 21 10
Recurring [Member] | Level 3 [Member] | Common Stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 203 177
Recurring [Member] | Level 3 [Member] | Non-redeemable preferred stock [Member]
    
Assets [Abstract]    
Available-for-sale Securities, Equity Securities $ 441 $ 395