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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value $ 8,439 $ 10,647
Fixed maturities, held-to-maturity 8,882 10,153
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,419 1,406
Short-term debt 475 999
Long-term debt 14,402 15,169
Liabilities 148,604 140,340
Cost    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity 8,848 10,118
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,419 1,406
Short-term debt 475 999
Long-term debt 14,402 15,169
Trust preferred securities 308 308
Liabilities 16,604 17,882
Level 1 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,299 1,192
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 0 0
Short-term debt, Fair Value 0 0
Long-term debt, Fair Value 0 0
Trust preferred securities 0 0
Liabilities 0 0
Level 2 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 7,140 9,455
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,419 1,406
Short-term debt, Fair Value 473 1,019
Long-term debt, Fair Value 12,495 16,848
Trust preferred securities 383 460
Liabilities 14,770 19,733
Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 0 0
Short-term debt, Fair Value 0 0
Long-term debt, Fair Value 0 0
Trust preferred securities 0 0
Liabilities 0 0
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 8,439 10,647
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,419 1,406
Short-term debt, Fair Value 473 1,019
Long-term debt, Fair Value 12,495 16,848
Trust preferred securities 383 460
Liabilities 14,770 19,733
U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,370 1,244
Fixed maturities, held-to-maturity 1,417 1,213
U.S. Treasury / Agency | Cost    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity 1,417 1,213
U.S. Treasury / Agency | Level 1 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,299 1,192
U.S. Treasury / Agency | Level 2 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 71 52
U.S. Treasury / Agency | Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
U.S. Treasury / Agency | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,370 1,244
Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,054 1,262
Fixed maturities, held-to-maturity 1,140 1,201
Non-U.S. | Cost    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity 1,136 1,196
Non-U.S. | Level 1 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Non-U.S. | Level 2 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,054 1,262
Non-U.S. | Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Non-U.S. | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,054 1,262
Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,580 2,201
Fixed maturities, held-to-maturity 1,733 2,032
Corporate and asset-backed securities | Cost    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity 1,705 2,004
Corporate and asset-backed securities | Level 1 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Corporate and asset-backed securities | Level 2 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,580 2,201
Corporate and asset-backed securities | Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Corporate and asset-backed securities | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,580 2,201
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,351 1,803
Fixed maturities, held-to-maturity 1,456 1,731
Mortgage-backed securities | Cost    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity 1,455 1,730
Mortgage-backed securities | Level 1 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Mortgage-backed securities | Level 2 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,351 1,803
Mortgage-backed securities | Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Mortgage-backed securities | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,351 1,803
Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 3,084 4,137
Fixed maturities, held-to-maturity 3,136 3,976
Municipal | Cost    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity 3,135 3,975
Municipal | Level 1 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Municipal | Level 2 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 3,084 4,137
Municipal | Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Municipal | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value $ 3,084 $ 4,137