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Investments and Derivative Instruments (Details 14) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivative Classification by Hedge Destination and Derivative Type    
Asset Derivatives, Fair Value $ 2,848 $ 3,396
Liability Derivatives, Fair Value 1,715 1,895
International [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 68,700 58,500
GMWB hedging instruments [Member] | U.S. [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 19,220 18,622
Net Derivatives, Fair Value 346 572
Asset Derivatives, Fair Value 564 743
Liability Derivatives, Fair Value (218) (171)
Macro Hedge Program [Member] | U.S. [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 6,549 7,442
Net Derivatives, Fair Value 243 286
Asset Derivatives, Fair Value 309 356
Liability Derivatives, Fair Value (66) (70)
Cash flow hedges [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 6,407 6,226
Net Derivatives, Fair Value 184 254
Asset Derivatives, Fair Value 208 274
Liability Derivatives, Fair Value (24) (20)
Cash Flow Hedging Interest Rate Swaps [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 6,264 6,063
Net Derivatives, Fair Value 200 271
Asset Derivatives, Fair Value 204 271
Liability Derivatives, Fair Value (4) 0
Cash flow hedges foreign currency swaps [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 143 163
Net Derivatives, Fair Value (16) (17)
Asset Derivatives, Fair Value 4 3
Liability Derivatives, Fair Value (20) (20)
Fair value hedges [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 1,576 793
Net Derivatives, Fair Value (35) (39)
Asset Derivatives, Fair Value 13 16
Liability Derivatives, Fair Value (48) (55)
Fair Value Hedging Interest Rate Swaps [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 1,536 753
Net Derivatives, Fair Value (48) (55)
Asset Derivatives, Fair Value 0 0
Liability Derivatives, Fair Value (48) (55)
Fair value hedges - Foreign currency swaps [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 40 40
Net Derivatives, Fair Value 13 16
Asset Derivatives, Fair Value 13 16
Liability Derivatives, Fair Value 0 0
Interest Rate Swaps Caps Floors and Futures [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 9,089 17,117
Net Derivatives, Fair Value (515) (497)
Asset Derivatives, Fair Value 431 556
Liability Derivatives, Fair Value (946) (1,053)
Foreign Currency Swaps and Forwards Non-qualifying as Hedges [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 261 355
Net Derivatives, Fair Value (12) (16)
Asset Derivatives, Fair Value 6 5
Liability Derivatives, Fair Value (18) (21)
3 Win Related Foreign Currency Swaps [Member] | JAPAN [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 1,816 1,816
Net Derivatives, Fair Value (257) (127)
Asset Derivatives, Fair Value 0 0
Liability Derivatives, Fair Value (257) (127)
Fixed annuity hedging instruments [Member] | JAPAN [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 1,586 1,652
Net Derivatives, Fair Value 118 224
Asset Derivatives, Fair Value 147 228
Liability Derivatives, Fair Value (29) (4)
Credit Derivatives that Purchase Credit Protection [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 1,185 1,823
Net Derivatives, Fair Value (7) (8)
Asset Derivatives, Fair Value 5 5
Liability Derivatives, Fair Value (12) (13)
Credit Derivatives that Assume Credit Risk [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 2,533 2,745
Net Derivatives, Fair Value 39 (29)
Asset Derivatives, Fair Value 54 19
Liability Derivatives, Fair Value (15) (48)
Credit Derivatives in Offsetting Positions [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 9,056 9,497
Net Derivatives, Fair Value (24) (32)
Asset Derivatives, Fair Value 81 94
Liability Derivatives, Fair Value (105) (126)
Equity index swaps options [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 972 994
Net Derivatives, Fair Value 21 47
Asset Derivatives, Fair Value 33 57
Liability Derivatives, Fair Value (12) (10)
GMWB product derivatives [Member] | U.S. [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 27,695 28,868
Net Derivatives, Fair Value (795) (1,249)
Asset Derivatives, Fair Value 0 0
Liability Derivatives, Fair Value (795) (1,249)
GMWB Reinsurance [Member] | U.S. [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 5,463 5,773
Net Derivatives, Fair Value 139 191
Asset Derivatives, Fair Value 139 191
Liability Derivatives, Fair Value 0 0
International program product derivatives [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 2,301 2,454
Net Derivatives, Fair Value (30) (48)
Asset Derivatives, Fair Value 0 0
Liability Derivatives, Fair Value (30) (48)
International program hedging instruments [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 72,123 63,085
Net Derivatives, Fair Value 375 169
Asset Derivatives, Fair Value 975 1,020
Liability Derivatives, Fair Value (600) (851)
Contingent Capital Facility Put Option [Member]
    
Derivative Classification by Hedge Destination and Derivative Type    
Net Derivatives, Notional Amount 500 500
Net Derivatives, Fair Value 22 23
Asset Derivatives, Fair Value 22 23
Liability Derivatives, Fair Value $ 0 $ 0