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Assets by Class of Instrument that are Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | $ 45,233 | $ 46,781
Available-for-sale equity securities |  | 435 | 396
Limited partnerships |  | 2,968 | 2,821
Derivative assets, fair value |  | 80 | 131
Total other invested assets |  | 702 | 731
Separate account assets |  | 4,553 | 4,509
Total assets |  | 52,627 | 54,037
Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale equity securities | [1] | 0 | 0
Separate account assets | [1] | 0 | 0
Total assets | [1] | 2,298 | 2,173
Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 80 | 131
Short-term investments |  | 12 | 27
Total other invested assets |  | 92 | 158
Other invested assets | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value | [1] | 0 | 0
Short-term investments | [1] | 0 | 0
Total other invested assets | [1] | 0 | 0
Interest rate swaps | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 26 | 55
Interest rate swaps | Other invested assets | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value | [1] | 0 | 0
Foreign currency swaps | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 12 | 10
Foreign currency swaps | Other invested assets | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value | [1] | 0 | 0
Equity index options | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 21 | 15
Equity index options | Other invested assets | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value | [1] | 0 | 0
Forward bond purchase commitments | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 21 | 51
Forward bond purchase commitments | Other invested assets | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value | [1] | 0 | 0
U.S. government, agencies and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 3,512 | 3,494
State and Political Subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,168 | 2,302
Non-U.S. government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 709 | 626
U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 26,813 | 27,985
U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 4,232 | 4,273
U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,322 | 2,372
U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 7,028 | 7,278
U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 4,353 | 4,505
U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,750 | 3,023
U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,094 | 1,233
U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,145 | 2,181
U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,553 | 1,649
U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,062 | 1,162
U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 274 | 309
Non-U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 7,636 | 7,811
Non-U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 710 | 685
Non-U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,047 | 1,027
Non-U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,852 | 1,948
Non-U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 598 | 616
Non-U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 806 | 891
Non-U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 803 | 797
Non-U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 595 | 561
Non-U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 231 | 221
Non-U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 422 | 364
Non-U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 572 | 701
Residential mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 851 | 907
Commercial mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,312 | 1,418
Other asset-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,232 | 2,238
Fixed maturity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 45,233 | 46,781
Fixed maturity securities | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 3,512 | 3,494
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | State and Political Subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,168 | 2,302
Fixed maturity securities | State and Political Subdivisions | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 709 | 626
Fixed maturity securities | Non-U.S. government | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 26,813 | 27,985
Fixed maturity securities | U.S. corporate | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 4,232 | 4,273
Fixed maturity securities | U.S. corporate | Utilities | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,322 | 2,372
Fixed maturity securities | U.S. corporate | Energy | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 7,028 | 7,278
Fixed maturity securities | U.S. corporate | Finance and insurance | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 4,353 | 4,505
Fixed maturity securities | U.S. corporate | Consumer—non-cyclical | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,750 | 3,023
Fixed maturity securities | U.S. corporate | Technology and communications | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,094 | 1,233
Fixed maturity securities | U.S. corporate | Industrial | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,145 | 2,181
Fixed maturity securities | U.S. corporate | Capital goods | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,553 | 1,649
Fixed maturity securities | U.S. corporate | Consumer—cyclical | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,062 | 1,162
Fixed maturity securities | U.S. corporate | Transportation | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 274 | 309
Fixed maturity securities | U.S. corporate | Other | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 7,636 | 7,811
Fixed maturity securities | Non-U.S. corporate | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 710 | 685
Fixed maturity securities | Non-U.S. corporate | Utilities | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,047 | 1,027
Fixed maturity securities | Non-U.S. corporate | Energy | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,852 | 1,948
Fixed maturity securities | Non-U.S. corporate | Finance and insurance | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 598 | 616
Fixed maturity securities | Non-U.S. corporate | Consumer—non-cyclical | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 806 | 891
Fixed maturity securities | Non-U.S. corporate | Technology and communications | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 803 | 797
Fixed maturity securities | Non-U.S. corporate | Industrial | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 595 | 561
Fixed maturity securities | Non-U.S. corporate | Capital goods | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 231 | 221
Fixed maturity securities | Non-U.S. corporate | Consumer—cyclical | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 422 | 364
Fixed maturity securities | Non-U.S. corporate | Transportation | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Non-U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 572 | 701
Fixed maturity securities | Non-U.S. corporate | Other | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Residential mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 851 | 907
Fixed maturity securities | Residential mortgage-backed | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Commercial mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,312 | 1,418
Fixed maturity securities | Commercial mortgage-backed | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Fixed maturity securities | Other asset-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,232 | 2,238
Fixed maturity securities | Other asset-backed | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [1] | 0 | 0
Limited partnerships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Limited partnerships |  | 2,314 | 2,193
Limited partnerships | Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Limited partnerships | [1] | 2,298 | 2,173
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale equity securities |  | 364 | 321
Separate account assets |  | 4,553 | 4,509
Total assets |  | 4,917 | 4,830
Level 1 | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Short-term investments |  | 0 | 0
Total other invested assets |  | 0 | 0
Level 1 | Interest rate swaps | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Level 1 | Foreign currency swaps | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Level 1 | Equity index options | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Level 1 | Forward bond purchase commitments | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Level 1 | Fixed maturity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | State and Political Subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Non-U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Residential mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Commercial mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Fixed maturity securities | Other asset-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 1 | Limited partnerships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Limited partnerships |  | 0 | 0
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale equity securities |  | 29 | 43
Separate account assets |  | 0 | 0
Total assets |  | 42,326 | 43,813
Level 2 | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 38 | 65
Short-term investments |  | 12 | 20
Total other invested assets |  | 50 | 85
Level 2 | Interest rate swaps | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 26 | 55
Level 2 | Foreign currency swaps | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 12 | 10
Level 2 | Equity index options | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Level 2 | Forward bond purchase commitments | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Level 2 | Fixed maturity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 42,247 | 43,685
Level 2 | Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 3,512 | 3,494
Level 2 | Fixed maturity securities | State and Political Subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,103 | 2,242
Level 2 | Fixed maturity securities | Non-U.S. government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 709 | 626
Level 2 | Fixed maturity securities | U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 24,829 | 25,895
Level 2 | Fixed maturity securities | U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 3,389 | 3,392
Level 2 | Fixed maturity securities | U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,277 | 2,312
Level 2 | Fixed maturity securities | U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 6,348 | 6,561
Level 2 | Fixed maturity securities | U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 4,290 | 4,436
Level 2 | Fixed maturity securities | U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,738 | 3,011
Level 2 | Fixed maturity securities | U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,079 | 1,210
Level 2 | Fixed maturity securities | U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,091 | 2,146
Level 2 | Fixed maturity securities | U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,436 | 1,527
Level 2 | Fixed maturity securities | U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,042 | 1,140
Level 2 | Fixed maturity securities | U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 139 | 160
Level 2 | Fixed maturity securities | Non-U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 6,825 | 6,981
Level 2 | Fixed maturity securities | Non-U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 430 | 416
Level 2 | Fixed maturity securities | Non-U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 928 | 896
Level 2 | Fixed maturity securities | Non-U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,719 | 1,814
Level 2 | Fixed maturity securities | Non-U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 521 | 535
Level 2 | Fixed maturity securities | Non-U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 789 | 867
Level 2 | Fixed maturity securities | Non-U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 743 | 734
Level 2 | Fixed maturity securities | Non-U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 550 | 508
Level 2 | Fixed maturity securities | Non-U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 224 | 220
Level 2 | Fixed maturity securities | Non-U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 400 | 342
Level 2 | Fixed maturity securities | Non-U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 521 | 649
Level 2 | Fixed maturity securities | Residential mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 849 | 904
Level 2 | Fixed maturity securities | Commercial mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,301 | 1,407
Level 2 | Fixed maturity securities | Other asset-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,119 | 2,136
Level 2 | Limited partnerships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Limited partnerships |  | 0 | 0
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale equity securities |  | 42 | 32
Separate account assets |  | 0 | 0
Total assets |  | 3,086 | 3,221
Level 3 | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 42 | 66
Short-term investments |  | 0 | 7
Total other invested assets |  | 42 | 73
Level 3 | Interest rate swaps | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Level 3 | Foreign currency swaps | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 0 | 0
Level 3 | Equity index options | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 21 | 15
Level 3 | Forward bond purchase commitments | Other invested assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets, fair value |  | 21 | 51
Level 3 | Fixed maturity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,986 | 3,096
Level 3 | Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 3 | Fixed maturity securities | State and Political Subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 65 | 60
Level 3 | Fixed maturity securities | Non-U.S. government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Level 3 | Fixed maturity securities | U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 1,984 | 2,090
Level 3 | Fixed maturity securities | U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 843 | 881
Level 3 | Fixed maturity securities | U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 45 | 60
Level 3 | Fixed maturity securities | U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 680 | 717
Level 3 | Fixed maturity securities | U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 63 | 69
Level 3 | Fixed maturity securities | U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 12 | 12
Level 3 | Fixed maturity securities | U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 15 | 23
Level 3 | Fixed maturity securities | U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 54 | 35
Level 3 | Fixed maturity securities | U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 117 | 122
Level 3 | Fixed maturity securities | U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 20 | 22
Level 3 | Fixed maturity securities | U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 135 | 149
Level 3 | Fixed maturity securities | Non-U.S. corporate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 811 | 830
Level 3 | Fixed maturity securities | Non-U.S. corporate | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 280 | 269
Level 3 | Fixed maturity securities | Non-U.S. corporate | Energy |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 119 | 131
Level 3 | Fixed maturity securities | Non-U.S. corporate | Finance and insurance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 133 | 134
Level 3 | Fixed maturity securities | Non-U.S. corporate | Consumer—non-cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 77 | 81
Level 3 | Fixed maturity securities | Non-U.S. corporate | Technology and communications |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 17 | 24
Level 3 | Fixed maturity securities | Non-U.S. corporate | Industrial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 60 | 63
Level 3 | Fixed maturity securities | Non-U.S. corporate | Capital goods |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 45 | 53
Level 3 | Fixed maturity securities | Non-U.S. corporate | Consumer—cyclical |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 7 | 1
Level 3 | Fixed maturity securities | Non-U.S. corporate | Transportation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 22 | 22
Level 3 | Fixed maturity securities | Non-U.S. corporate | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 51 | 52
Level 3 | Fixed maturity securities | Residential mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2 | 3
Level 3 | Fixed maturity securities | Commercial mortgage-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 11 | 11
Level 3 | Fixed maturity securities | Other asset-backed |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 113 | 102
Level 3 | Limited partnerships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Limited partnerships |  | $ 16 | $ 20
[1] | Limited partnerships that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy.

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