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Fair value measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value $ 8,109 $ 8,439
Debt Securities, Held-to-maturity 8,458 8,882
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,420 1,419
Short-term debt 0 475
Long-term debt 14,375 14,402
Total liabilities 148,428 148,498
Portion at Other than Fair Value Measurement | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,267 1,299
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 0 0
Short-Term Debt, Fair Value   0
Long-term Debt, Fair Value 0 0
Trust preferred securities 0 0
Total liabilities 0 0
Portion at Other than Fair Value Measurement | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 6,842 7,140
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,420 1,419
Short-Term Debt, Fair Value   473
Long-term Debt, Fair Value 12,892 12,495
Trust preferred securities 368 383
Total liabilities 14,680 14,770
Portion at Other than Fair Value Measurement | Level 3    
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
Long-term Debt, Fair Value 0 0
Trust preferred securities 0 0
Total liabilities 0 0
Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 8,109 8,439
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,420 1,419
Short-Term Debt, Fair Value   473
Long-term Debt, Fair Value 12,892 12,495
Trust preferred securities 368 383
Total liabilities 14,680 14,770
Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 8,425 8,848
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,420 1,419
Short-term debt   475
Long-term debt 14,375 14,402
Trust preferred securities 308 308
Total liabilities 16,103 16,604
U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,340 1,370
Debt Securities, Held-to-maturity 1,371 1,417
U.S. Treasury / Agency | Portion at Other than Fair Value Measurement | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,267 1,299
U.S. Treasury / Agency | Portion at Other than Fair Value Measurement | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 73 71
U.S. Treasury / Agency | Portion at Other than Fair Value Measurement | Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
U.S. Treasury / Agency | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,340 1,370
U.S. Treasury / Agency | Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 1,371 1,417
Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,036 1,054
Debt Securities, Held-to-maturity 1,110 1,140
Non-U.S. | Portion at Other than Fair Value Measurement | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Non-U.S. | Portion at Other than Fair Value Measurement | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,036 1,054
Non-U.S. | Portion at Other than Fair Value Measurement | Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Non-U.S. | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,036 1,054
Non-U.S. | Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 1,106 1,136
Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,576 1,580
Debt Securities, Held-to-maturity 1,699 1,733
Corporate and asset-backed securities | Portion at Other than Fair Value Measurement | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Corporate and asset-backed securities | Portion at Other than Fair Value Measurement | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,576 1,580
Corporate and asset-backed securities | Portion at Other than Fair Value Measurement | Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Corporate and asset-backed securities | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,576 1,580
Corporate and asset-backed securities | Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 1,671 1,705
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,282 1,351
Debt Securities, Held-to-maturity 1,373 1,456
Mortgage-backed securities | Portion at Other than Fair Value Measurement | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Mortgage-backed securities | Portion at Other than Fair Value Measurement | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,282 1,351
Mortgage-backed securities | Portion at Other than Fair Value Measurement | Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Mortgage-backed securities | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 1,282 1,351
Mortgage-backed securities | Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 1,372 1,455
Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 2,875 3,084
Debt Securities, Held-to-maturity 2,905 3,136
Municipal | Portion at Other than Fair Value Measurement | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Municipal | Portion at Other than Fair Value Measurement | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 2,875 3,084
Municipal | Portion at Other than Fair Value Measurement | Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 0 0
Municipal | Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities, held-to-maturity, fair value 2,875 3,084
Municipal | Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity $ 2,905 $ 3,135