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Derivative Financial Instruments (Details) (USD $)
In Millions, except Share data, unless otherwise specified
Sep. 30, 2011
contract
counterparties
entity
Dec. 31, 2010
contract
counterparties
Derivatives, Fair Value  
Total asset derivatives, Notional amount$ 12,642$ 9,255
Total liability derivatives, Notional amount13,04324,651
Total derivatives, Notional amount25,68533,906
Total asset derivatives, Number of contracts21,18048,163
Total liability derivatives, Number of contracts22,33536,735
Total derivatives, Number of contracts43,51584,898
Asset derivatives, Gross asset311800
Asset derivatives, Gross liability(169)(146)
Total asset derivatives, Fair value, net142654
Liability derivatives, Gross asset84211
Liability derivatives, Gross liability(886)(1,223)
Total liability derivatives, Fair value, net(802)(1,012)
Total derivatives, Fair value, net(660)(358)
Number of stock rights held by the company related to derivative contracts (in shares)2,8602,768
Number of stock warrants held by the company related to derivative contracts (in shares)4,389,7071,379,932
Securities pledged in the form of margin deposits22 
Foreign currency and interest rate swap agreements | Other liabilities and accrued expenses | Derivatives designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount 435
Liability derivatives, Gross asset 34
Total liability derivatives, Fair value, net 34
Foreign currency and interest rate swap agreements | Contractholder funds. | Derivatives designated as accounting hedging instruments
  
Derivatives, Fair Value  
Liability derivatives, Gross asset 28
Total liability derivatives, Fair value, net 28
Interest rate swap agreements | Other investments. | Derivatives designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount101156
Asset derivatives, Gross liability(6)(18)
Total asset derivatives, Fair value, net(6)(18)
Interest rate swap agreements | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount4,4041,469
Asset derivatives, Gross asset11481
Asset derivatives, Gross liability (16)
Total asset derivatives, Fair value, net11465
Interest rate swap agreements | Other liabilities and accrued expenses | Derivatives designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount843,345
Liability derivatives, Gross asset 20
Liability derivatives, Gross liability(9)(201)
Total liability derivatives, Fair value, net(9)(181)
Interest rate swap agreements | Other liabilities and accrued expenses | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount4,9224,543
Liability derivatives, Gross asset7197
Liability derivatives, Gross liability(92)(68)
Total liability derivatives, Fair value, net(21)29
Interest rate swap agreements | Contractholder funds. | Derivatives designated as accounting hedging instruments
  
Derivatives, Fair Value  
Liability derivatives, Gross asset 2
Total liability derivatives, Fair value, net 2
Foreign currency swap agreements | Other investments. | Derivatives designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount15264
Asset derivatives, Gross asset33
Asset derivatives, Gross liability(10)(1)
Total asset derivatives, Fair value, net(7)2
Foreign currency swap agreements | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount5090
Asset derivatives, Gross asset46
Total asset derivatives, Fair value, net46
Foreign currency swap agreements | Other liabilities and accrued expenses | Derivatives designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount50138
Liability derivatives, Gross liability(4)(20)
Total liability derivatives, Fair value, net(4)(20)
Interest rate swaption agreements | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount3,0004,161
Asset derivatives, Gross asset150
Total asset derivatives, Fair value, net150
Interest rate swaption agreements | Other liabilities and accrued expenses | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount 4,400
Liability derivatives, Gross asset 18
Total liability derivatives, Fair value, net 18
Interest rate cap and floor agreements | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount1,726226
Asset derivatives, Gross asset 1
Asset derivatives, Gross liability(16)(3)
Total asset derivatives, Fair value, net(16)(2)
Interest rate cap and floor agreements | Other liabilities and accrued expenses | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount1,1173,216
Liability derivatives, Gross asset 1
Liability derivatives, Gross liability(18)(23)
Total liability derivatives, Fair value, net(18)(22)
Financial futures contracts and options | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Number of contracts 8,000
Asset derivatives, Gross asset 3
Total asset derivatives, Fair value, net 3
Financial futures contracts and options | Other assets. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Number of contracts 1,420
Financial futures contracts and options | Other liabilities and accrued expenses | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Number of contracts34615,150
Liability derivatives, Gross liability (1)
Total liability derivatives, Fair value, net (1)
Options and futures | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount17064
Total asset derivatives, Number of contracts20,16638,451
Asset derivatives, Gross asset129359
Asset derivatives, Gross liability(2) 
Total asset derivatives, Fair value, net127359
Options and futures | Other assets. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Number of contracts1,014292
Asset derivatives, Gross asset3 
Total asset derivatives, Fair value, net3 
Options and futures | Other liabilities and accrued expenses | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount 64
Total liability derivatives, Number of contracts21,98921,585
Liability derivatives, Gross asset 2
Liability derivatives, Gross liability(69)(170)
Total liability derivatives, Fair value, net(69)(168)
Foreign currency forwards and options | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount136257
Asset derivatives, Gross asset27
Asset derivatives, Gross liability (1)
Total asset derivatives, Fair value, net26
Foreign currency forwards and options | Other liabilities and accrued expenses | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount270316
Liability derivatives, Gross asset22
Liability derivatives, Gross liability(15)(1)
Total liability derivatives, Fair value, net(13)1
Conversion options | Fixed income securities | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount5820
Asset derivatives, Gross asset 238
Asset derivatives, Gross liability (2)
Total asset derivatives, Fair value, net 236
Equity-indexed call options | Fixed income securities | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount150300
Asset derivatives, Gross asset747
Total asset derivatives, Fair value, net747
Credit default swaps | Fixed income securities | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount172181
Asset derivatives, Gross liability(119)(88)
Total asset derivatives, Fair value, net(119)(88)
Other embedded derivative financial instruments | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount1,0001,000
Other embedded derivative financial instruments | Contractholder funds. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount8585
Liability derivatives, Gross liability(8)(3)
Total liability derivatives, Fair value, net(8)(3)
Guaranteed accumulation benefits | Contractholder funds. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount9561,067
Liability derivatives, Gross liability(97)(88)
Total liability derivatives, Fair value, net(97)(88)
Guaranteed withdrawal benefits | Contractholder funds. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount647739
Liability derivatives, Gross liability(51)(47)
Total liability derivatives, Fair value, net(51)(47)
Equity-indexed and forward starting options in life and annuity product contracts | Contractholder funds. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount4,2114,694
Liability derivatives, Gross liability(441)(515)
Total liability derivatives, Fair value, net(441)(515)
Credit Default Swaps - Buying Protection | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount1,312299
Asset derivatives, Gross asset472
Asset derivatives, Gross liability(4)(7)
Total asset derivatives, Fair value, net43(5)
Credit Default Swaps - Buying Protection | Other liabilities and accrued expenses | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount3111,127
Liability derivatives, Gross asset106
Liability derivatives, Gross liability(3)(19)
Total liability derivatives, Fair value, net7(13)
Credit Default Swaps - Selling Protection | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount255150
Asset derivatives, Gross asset 2
Asset derivatives, Gross liability(12)(10)
Total asset derivatives, Fair value, net(12)(8)
Credit Default Swaps - Selling Protection | Other liabilities and accrued expenses | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total liability derivatives, Notional amount390482
Liability derivatives, Gross asset11
Liability derivatives, Gross liability(79)(67)
Total liability derivatives, Fair value, net(78)(66)
Other contracts | Other investments. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount513
Other contracts | Other assets. | Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount45
Asset derivatives, Gross asset11
Total asset derivatives, Fair value, net11
Derivatives designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount253220
Total liability derivatives, Notional amount1343,918
Asset derivatives, Gross asset33
Asset derivatives, Gross liability(16)(19)
Total asset derivatives, Fair value, net(13)(16)
Liability derivatives, Gross asset 84
Liability derivatives, Gross liability(13)(221)
Total liability derivatives, Fair value, net(13)(137)
Derivatives not designated as accounting hedging instruments
  
Derivatives, Fair Value  
Total asset derivatives, Notional amount12,3899,035
Total liability derivatives, Notional amount12,90920,733
Total asset derivatives, Number of contracts21,18048,163
Total liability derivatives, Number of contracts22,33536,735
Asset derivatives, Gross asset308797
Asset derivatives, Gross liability(153)(127)
Total asset derivatives, Fair value, net155670
Liability derivatives, Gross asset84127
Liability derivatives, Gross liability(873)(1,002)
Total liability derivatives, Fair value, net$ (789)$ (875)