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Fair Value Hierarchy Levels of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Assets:    
Swaps $ 495 $ 564
Total assets 60,127 56,454
Liabilities:    
Total liabilities 584 741
Mortgage- and asset-backed Securities | Level 1 | Fixed Maturities
    
Assets:    
Securities 0 0
Mortgage- and asset-backed Securities | Level 2 | Fixed Maturities
    
Assets:    
Securities 1,241 1,539
Mortgage- and asset-backed Securities | Level 3 | Fixed Maturities
    
Assets:    
Securities 257 267
Mortgage- and asset-backed Securities | Fixed Maturities
    
Assets:    
Securities 1,498 1,806
Public Utilities | Level 1 | Fixed Maturities
    
Assets:    
Securities 0 0
Public Utilities | Level 2 | Fixed Maturities
    
Assets:    
Securities 5,584 5,369
Public Utilities | Level 3 | Fixed Maturities
    
Assets:    
Securities 0 0
Public Utilities | Fixed Maturities
    
Assets:    
Securities 5,584 5,369
Sovereign and Supranational | Level 1 | Fixed Maturities
    
Assets:    
Securities 0 0
Sovereign and Supranational | Level 2 | Fixed Maturities
    
Assets:    
Securities 2,277 1,394
Sovereign and Supranational | Level 3 | Fixed Maturities
    
Assets:    
Securities 0 0
Sovereign and Supranational | Fixed Maturities
    
Assets:    
Securities 2,277 1,394
Banks/financial Institutions | Level 1 | Fixed Maturities
    
Assets:    
Securities 0 0
Banks/financial Institutions | Level 1 | Perpetual Securities
    
Assets:    
Securities 0 0
Banks/financial Institutions | Level 2 | Fixed Maturities
    
Assets:    
Securities 7,518 8,047
Banks/financial Institutions | Level 2 | Perpetual Securities
    
Assets:    
Securities 6,746 7,169
Banks/financial Institutions | Level 3 | Fixed Maturities
    
Assets:    
Securities 398 386
Banks/financial Institutions | Level 3 | Perpetual Securities
    
Assets:    
Securities 0 0
Banks/financial Institutions | Fixed Maturities
    
Assets:    
Securities 7,916 8,433
Banks/financial Institutions | Perpetual Securities
    
Assets:    
Securities 6,746 7,169
Other Corporate | Level 1 | Fixed Maturities
    
Assets:    
Securities 0 0
Other Corporate | Level 1 | Perpetual Securities
    
Assets:    
Securities 0 0
Other Corporate | Level 2 | Fixed Maturities
    
Assets:    
Securities 14,335 13,162
Other Corporate | Level 2 | Perpetual Securities
    
Assets:    
Securities 357 343
Other Corporate | Level 3 | Fixed Maturities
    
Assets:    
Securities 0 0
Other Corporate | Level 3 | Perpetual Securities
    
Assets:    
Securities 0 0
Other Corporate | Fixed Maturities
    
Assets:    
Securities 14,335 13,162
Other Corporate | Perpetual Securities
    
Assets:    
Securities 357 343
Municipalities | Level 1 | Fixed Maturities
    
Assets:    
Securities 0 0
Municipalities | Level 2 | Fixed Maturities
    
Assets:    
Securities 1,025 973
Municipalities | Level 3 | Fixed Maturities
    
Assets:    
Securities 0 0
Municipalities | Fixed Maturities
    
Assets:    
Securities 1,025 973
Collateralized Debt Obligations | Level 1 | Fixed Maturities
    
Assets:    
Securities 0 0
Collateralized Debt Obligations | Level 2 | Fixed Maturities
    
Assets:    
Securities 0 0
Collateralized Debt Obligations | Level 3 | Fixed Maturities
    
Assets:    
Securities 4 5
Collateralized Debt Obligations | Fixed Maturities
    
Assets:    
Securities 4 5
Interest rate swaps
    
Assets:    
Swaps 125 124
Liabilities:    
Swaps 5 70
Interest rate swaps | Level 1
    
Assets:    
Swaps 0 0
Liabilities:    
Swaps 0 0
Interest rate swaps | Level 2
    
Assets:    
Swaps 125 124
Liabilities:    
Swaps 5 70
Interest rate swaps | Level 3
    
Assets:    
Swaps 0 0
Liabilities:    
Swaps 0 0
Foreign currency swaps
    
Assets:    
Swaps 370 440
Liabilities:    
Swaps 326 328
Foreign currency swaps | Level 1
    
Assets:    
Swaps 0 0
Liabilities:    
Swaps 0 0
Foreign currency swaps | Level 2
    
Assets:    
Swaps 150 151
Liabilities:    
Swaps 270 280
Foreign currency swaps | Level 3
    
Assets:    
Swaps 220 289
Liabilities:    
Swaps 56 48
Credit default swaps
    
Liabilities:    
Swaps 253 343
Credit default swaps | Level 1
    
Liabilities:    
Swaps 0 0
Credit default swaps | Level 2
    
Liabilities:    
Swaps 0 0
Credit default swaps | Level 3
    
Liabilities:    
Swaps 253 343
Level 1
    
Assets:    
Swaps 0 0
Total assets 19,203 16,548
Liabilities:    
Total liabilities 0 0
Level 1 | Fixed Maturities
    
Assets:    
Securities 19,189 16,534
Level 1 | Fixed Maturities | Government and Agencies Debt Securities
    
Assets:    
Securities 19,189 16,534
Level 1 | Perpetual Securities
    
Assets:    
Securities 0 0
Level 1 | Equity Securities
    
Assets:    
Securities 14 14
Level 2
    
Assets:    
Swaps 275 275
Total assets 40,041 38,955
Liabilities:    
Total liabilities 275 350
Level 2 | Fixed Maturities
    
Assets:    
Securities 32,658 31,163
Level 2 | Fixed Maturities | Government and Agencies Debt Securities
    
Assets:    
Securities 678 679
Level 2 | Perpetual Securities
    
Assets:    
Securities 7,103 7,512
Level 2 | Equity Securities
    
Assets:    
Securities 5 5
Level 3
    
Assets:    
Swaps 220 289
Total assets 883 951
Liabilities:    
Total liabilities 309 391
Level 3 | Fixed Maturities
    
Assets:    
Securities 659 658
Level 3 | Fixed Maturities | Government and Agencies Debt Securities
    
Assets:    
Securities 0 0
Level 3 | Perpetual Securities
    
Assets:    
Securities 0 0
Level 3 | Equity Securities
    
Assets:    
Securities 4 4
Fixed Maturities
    
Assets:    
Securities 52,506 48,355
Fixed Maturities | Government and Agencies Debt Securities
    
Assets:    
Securities 19,867 17,213
Perpetual Securities
    
Assets:    
Securities 7,103 7,512
Equity Securities
    
Assets:    
Securities $ 23 $ 23