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Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets [Abstract]    
Short-term investments $ 11,801 $ 17,310
Mortgage Loans on Real Estate, Commercial and Consumer, Net 56,641 56,915
Mortgage loans held-for-sale 9,204 10,716
Total derivative assets 12,447 16,200
Other Investments 20,172 23,581
Net embedded derivatives within asset host contracts 256 293
Separate account assets 221,975 203,023
Liabilities [Abstract]    
Total derivative liabilities 4,207 4,011
Net embedded derivatives within liability host contracts 2,758 4,584
Liability related to securitized reverse residential mortgage loans 8,252 7,626
Variable interest entities
   
Assets [Abstract]    
Mortgage Loans on Real Estate, Commercial and Consumer, Net 3,073 3,187
Other Investments 98 98
Liabilities [Abstract]    
Long-term debt of CSEs 2,916 3,068
Recurring [Member]
   
Assets [Abstract]    
Actively Traded Securities 19,026 18,268
Short-term investments 11,307 16,860
Total mortgage loans 12,228 13,854
Mortgage loans held-for-sale 9,204 10,716
MSRs 727 666
Investment funds 442 436
Total derivative assets 12,447 16,200
Other Investments 13,616 17,302
Net embedded derivatives within asset host contracts 330 363
Separate account assets 221,975 203,023
Total assets 635,976 622,964
Liabilities [Abstract]    
Total derivative liabilities 4,207 4,011
Net embedded derivatives within liability host contracts 2,758 4,584
Liability related to securitized reverse residential mortgage loans 8,252 7,626
Trading liabilities 169 127
Total liabilities 18,302 19,416
Recurring [Member] | Interest rate contracts [Member]
   
Assets [Abstract]    
Total derivative assets 8,385 10,796
Liabilities [Abstract]    
Total derivative liabilities 2,264 2,480
Recurring [Member] | Foreign currency contracts [Member]
   
Assets [Abstract]    
Total derivative assets 1,119 1,378
Liabilities [Abstract]    
Total derivative liabilities 1,361 1,120
Recurring [Member] | Credit contracts [Member]
   
Assets [Abstract]    
Total derivative assets 173 330
Liabilities [Abstract]    
Total derivative liabilities 51 113
Recurring [Member] | Equity market contracts [Member]
   
Assets [Abstract]    
Total derivative assets 2,770 3,696
Liabilities [Abstract]    
Total derivative liabilities 531 298
Recurring [Member] | Trading Account Assets [Member]
   
Assets [Abstract]    
Actively Traded Securities 544 473
Recurring [Member] | FVO general account securities [Member]
   
Assets [Abstract]    
Actively Traded Securities 274 267
Recurring [Member] | FVO contractholder-directed unit-linked investments [Member]
   
Assets [Abstract]    
Actively Traded Securities 18,119 17,411
Recurring [Member] | FVO securities held by consolidated securitization entities [Member]
   
Assets [Abstract]    
Actively Traded Securities 89 117
Recurring [Member] | Variable interest entities
   
Assets [Abstract]    
Mortgage Loans on Real Estate, Commercial and Consumer, Net 3,024 3,138
Liabilities [Abstract]    
Long-term debt of CSEs 2,916 3,068
Recurring [Member] | Fixed maturity securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 354,451 350,271
Recurring [Member] | U.S. corporate securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 105,273 105,785
Recurring [Member] | Foreign corporate securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 65,354 64,018
Recurring [Member] | Foreign government debt securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 55,338 52,536
Recurring [Member] | RMBS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 41,279 42,637
Recurring [Member] | U.S. Treasury and agency securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 41,416 40,012
Recurring [Member] | CMBS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 18,732 19,069
Recurring [Member] | ABS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 13,143 12,979
Recurring [Member] | State and political subdivision securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 13,916 13,235
Recurring [Member] | Equity Securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 3,043 3,023
Recurring [Member] | Common Stock [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 2,242 2,205
Recurring [Member] | Non-redeemable preferred stock [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 801 818
Recurring [Member] | Level 1 [Member]
   
Assets [Abstract]    
Actively Traded Securities 8,536 7,572
Short-term investments 5,602 8,150
Total mortgage loans 0 0
Mortgage loans held-for-sale 0 0
MSRs 0 0
Investment funds 322 312
Total derivative assets 55 62
Other Investments 377 374
Net embedded derivatives within asset host contracts 0 0
Separate account assets 31,103 28,191
Total assets 67,324 65,093
Liabilities [Abstract]    
Total derivative liabilities 57 103
Net embedded derivatives within liability host contracts 0 0
Liability related to securitized reverse residential mortgage loans 0 0
Trading liabilities 167 124
Total liabilities 224 227
Recurring [Member] | Level 1 [Member] | Interest rate contracts [Member]
   
Assets [Abstract]    
Total derivative assets 23 32
Liabilities [Abstract]    
Total derivative liabilities 46 91
Recurring [Member] | Level 1 [Member] | Foreign currency contracts [Member]
   
Assets [Abstract]    
Total derivative assets 1 1
Liabilities [Abstract]    
Total derivative liabilities 0 0
Recurring [Member] | Level 1 [Member] | Credit contracts [Member]
   
Assets [Abstract]    
Total derivative assets 0 0
Liabilities [Abstract]    
Total derivative liabilities 0 0
Recurring [Member] | Level 1 [Member] | Equity market contracts [Member]
   
Assets [Abstract]    
Total derivative assets 31 29
Liabilities [Abstract]    
Total derivative liabilities 11 12
Recurring [Member] | Level 1 [Member] | Trading Account Assets [Member]
   
Assets [Abstract]    
Actively Traded Securities 0 0
Recurring [Member] | Level 1 [Member] | FVO general account securities [Member]
   
Assets [Abstract]    
Actively Traded Securities 0 0
Recurring [Member] | Level 1 [Member] | FVO contractholder-directed unit-linked investments [Member]
   
Assets [Abstract]    
Actively Traded Securities 8,536 7,572
Recurring [Member] | Level 1 [Member] | FVO securities held by consolidated securitization entities [Member]
   
Assets [Abstract]    
Actively Traded Securities 0 0
Recurring [Member] | Level 1 [Member] | Variable interest entities
   
Assets [Abstract]    
Mortgage Loans on Real Estate, Commercial and Consumer, Net 0 0
Liabilities [Abstract]    
Long-term debt of CSEs 0 0
Recurring [Member] | Level 1 [Member] | Fixed maturity securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 20,804 19,987
Recurring [Member] | Level 1 [Member] | U.S. corporate securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 0 0
Recurring [Member] | Level 1 [Member] | Foreign corporate securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 0 0
Recurring [Member] | Level 1 [Member] | Foreign government debt securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 0 76
Recurring [Member] | Level 1 [Member] | RMBS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 0 0
Recurring [Member] | Level 1 [Member] | U.S. Treasury and agency securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 20,804 19,911
Recurring [Member] | Level 1 [Member] | CMBS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 0 0
Recurring [Member] | Level 1 [Member] | ABS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 0 0
Recurring [Member] | Level 1 [Member] | State and political subdivision securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 0 0
Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 902 819
Recurring [Member] | Level 1 [Member] | Common Stock [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 902 819
Recurring [Member] | Level 1 [Member] | Non-redeemable preferred stock [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 0 0
Recurring [Member] | Level 2 [Member]
   
Assets [Abstract]    
Actively Traded Securities 9,210 9,287
Short-term investments 5,243 8,120
Total mortgage loans 10,520 12,440
Mortgage loans held-for-sale 7,496 9,302
MSRs 0 0
Investment funds 120 124
Total derivative assets 11,553 14,746
Other Investments 11,673 14,870
Net embedded derivatives within asset host contracts 1 1
Separate account assets 189,490 173,507
Total assets 541,735 532,229
Liabilities [Abstract]    
Total derivative liabilities 3,938 3,750
Net embedded derivatives within liability host contracts 16 19
Liability related to securitized reverse residential mortgage loans 6,747 6,451
Trading liabilities 2 3
Total liabilities 13,537 13,175
Recurring [Member] | Level 2 [Member] | Interest rate contracts [Member]
   
Assets [Abstract]    
Total derivative assets 8,197 10,426
Liabilities [Abstract]    
Total derivative liabilities 2,195 2,351
Recurring [Member] | Level 2 [Member] | Foreign currency contracts [Member]
   
Assets [Abstract]    
Total derivative assets 1,059 1,316
Liabilities [Abstract]    
Total derivative liabilities 1,356 1,103
Recurring [Member] | Level 2 [Member] | Credit contracts [Member]
   
Assets [Abstract]    
Total derivative assets 132 301
Liabilities [Abstract]    
Total derivative liabilities 48 85
Recurring [Member] | Level 2 [Member] | Equity market contracts [Member]
   
Assets [Abstract]    
Total derivative assets 2,165 2,703
Liabilities [Abstract]    
Total derivative liabilities 339 211
Recurring [Member] | Level 2 [Member] | Trading Account Assets [Member]
   
Assets [Abstract]    
Actively Traded Securities 531 473
Recurring [Member] | Level 2 [Member] | FVO general account securities [Member]
   
Assets [Abstract]    
Actively Traded Securities 244 244
Recurring [Member] | Level 2 [Member] | FVO contractholder-directed unit-linked investments [Member]
   
Assets [Abstract]    
Actively Traded Securities 8,346 8,453
Recurring [Member] | Level 2 [Member] | FVO securities held by consolidated securitization entities [Member]
   
Assets [Abstract]    
Actively Traded Securities 89 117
Recurring [Member] | Level 2 [Member] | Variable interest entities
   
Assets [Abstract]    
Mortgage Loans on Real Estate, Commercial and Consumer, Net 3,024 3,138
Liabilities [Abstract]    
Long-term debt of CSEs 2,834 2,952
Recurring [Member] | Level 2 [Member] | Fixed maturity securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 314,171 312,519
Recurring [Member] | Level 2 [Member] | U.S. corporate securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 97,968 99,001
Recurring [Member] | Level 2 [Member] | Foreign corporate securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 60,708 59,648
Recurring [Member] | Level 2 [Member] | Foreign government debt securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 53,125 50,138
Recurring [Member] | Level 2 [Member] | RMBS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 39,033 41,035
Recurring [Member] | Level 2 [Member] | U.S. Treasury and agency securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 20,588 20,070
Recurring [Member] | Level 2 [Member] | CMBS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 17,970 18,316
Recurring [Member] | Level 2 [Member] | ABS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 10,945 11,129
Recurring [Member] | Level 2 [Member] | State and political subdivision securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 13,834 13,182
Recurring [Member] | Level 2 [Member] | Equity Securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 1,427 1,485
Recurring [Member] | Level 2 [Member] | Common Stock [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 1,072 1,105
Recurring [Member] | Level 2 [Member] | Non-redeemable preferred stock [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 355 380
Recurring [Member] | Level 3 [Member]
   
Assets [Abstract]    
Actively Traded Securities 1,280 1,409
Short-term investments 462 590
Total mortgage loans 1,708 1,414
Mortgage loans held-for-sale 1,708 1,414
MSRs 727 666
Investment funds 0 0
Total derivative assets 839 1,392
Other Investments 1,566 2,058
Net embedded derivatives within asset host contracts 329 362
Separate account assets 1,382 1,325
Total assets 26,917 25,642
Liabilities [Abstract]    
Total derivative liabilities 212 158
Net embedded derivatives within liability host contracts 2,742 4,565
Liability related to securitized reverse residential mortgage loans 1,505 1,175
Trading liabilities 0 0
Total liabilities 4,541 6,014
Recurring [Member] | Level 3 [Member] | Interest rate contracts [Member]
   
Assets [Abstract]    
Total derivative assets 165 338
Liabilities [Abstract]    
Total derivative liabilities 23 38
Recurring [Member] | Level 3 [Member] | Foreign currency contracts [Member]
   
Assets [Abstract]    
Total derivative assets 59 61
Liabilities [Abstract]    
Total derivative liabilities 5 17
Recurring [Member] | Level 3 [Member] | Credit contracts [Member]
   
Assets [Abstract]    
Total derivative assets 41 29
Liabilities [Abstract]    
Total derivative liabilities 3 28
Recurring [Member] | Level 3 [Member] | Equity market contracts [Member]
   
Assets [Abstract]    
Total derivative assets 574 964
Liabilities [Abstract]    
Total derivative liabilities 181 75
Recurring [Member] | Level 3 [Member] | Trading Account Assets [Member]
   
Assets [Abstract]    
Actively Traded Securities 13 0
Recurring [Member] | Level 3 [Member] | FVO general account securities [Member]
   
Assets [Abstract]    
Actively Traded Securities 30 23
Recurring [Member] | Level 3 [Member] | FVO contractholder-directed unit-linked investments [Member]
   
Assets [Abstract]    
Actively Traded Securities 1,237 1,386
Recurring [Member] | Level 3 [Member] | FVO securities held by consolidated securitization entities [Member]
   
Assets [Abstract]    
Actively Traded Securities 0 0
Recurring [Member] | Level 3 [Member] | Variable interest entities
   
Assets [Abstract]    
Mortgage Loans on Real Estate, Commercial and Consumer, Net 0 0
Liabilities [Abstract]    
Long-term debt of CSEs 82 116
Recurring [Member] | Level 3 [Member] | Fixed maturity securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 19,476 17,765
Recurring [Member] | Level 3 [Member] | U.S. corporate securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 7,305 6,784
Recurring [Member] | Level 3 [Member] | Foreign corporate securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 4,646 4,370
Recurring [Member] | Level 3 [Member] | Foreign government debt securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 2,213 2,322
Recurring [Member] | Level 3 [Member] | RMBS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 2,246 1,602
Recurring [Member] | Level 3 [Member] | U.S. Treasury and agency securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 24 31
Recurring [Member] | Level 3 [Member] | CMBS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 762 753
Recurring [Member] | Level 3 [Member] | ABS [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 2,198 1,850
Recurring [Member] | Level 3 [Member] | State and political subdivision securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 82 53
Recurring [Member] | Level 3 [Member] | Equity Securities [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 714 719
Recurring [Member] | Level 3 [Member] | Common Stock [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure 268 281
Recurring [Member] | Level 3 [Member] | Non-redeemable preferred stock [Member]
   
Assets [Abstract]    
Available-for-sale securities, fair value disclosure $ 446 $ 438