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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value $ 12,473 $ 13,005
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005) 11,696 12,581
Debt securities, held to maturity, net carrying value 11,651  
Repurchase agreements 1,413 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term debt 1,300 1,299
Long-term debt 14,830 13,559
Total liabilities 131,373 121,612
U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,309 1,347
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005) 1,240 1,318
Debt securities, held to maturity, net carrying value 1,240  
Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,374 1,485
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005) 1,273 1,423
Debt securities, held to maturity, net carrying value 1,266  
Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,414 2,468
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005) 2,204 2,349
Debt securities, held to maturity, net carrying value 2,168  
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,253 2,396
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005) 2,104 2,331
Debt securities, held to maturity, net carrying value 2,103  
Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 5,123 5,309
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005) 4,875 5,160
Debt securities, held to maturity, net carrying value 4,874  
Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,251 1,292
Repurchase agreements 0 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term Debt, Fair Value 0 0
Long-term Debt, Fair Value 0 0
Trust preferred securities 0 0
Total liabilities 0 0
Level 1 | U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,251 1,292
Level 1 | Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 1 | Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 1 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 1 | Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 11,222 11,681
Repurchase agreements 1,413 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term Debt, Fair Value 1,302 1,307
Long-term Debt, Fair Value 16,995 15,048
Trust preferred securities 462 467
Total liabilities 20,172 18,238
Level 2 | U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 58 55
Level 2 | Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,374 1,485
Level 2 | Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,414 2,436
Level 2 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,253 2,396
Level 2 | Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 5,123 5,309
Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 32
Repurchase agreements 0 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term Debt, Fair Value 0 0
Long-term Debt, Fair Value 0 0
Trust preferred securities 0 0
Total liabilities 0 0
Level 3 | U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 3 | Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 3 | Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 32
Level 3 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 3 | Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Estimate of Fair Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 12,473 13,005
Repurchase agreements 1,413 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term Debt, Fair Value 1,302 1,307
Long-term Debt, Fair Value 16,995 15,048
Trust preferred securities 462 467
Total liabilities 20,172 18,238
Estimate of Fair Value Measurement [Member] | U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,309 1,347
Estimate of Fair Value Measurement [Member] | Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,374 1,485
Estimate of Fair Value Measurement [Member] | Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,414 2,468
Estimate of Fair Value Measurement [Member] | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,253 2,396
Estimate of Fair Value Measurement [Member] | Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 5,123 5,309
Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005)   12,581
Debt securities, held to maturity, net carrying value 11,651  
Repurchase agreements 1,413 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term debt 1,300 1,299
Long-term debt 14,830 13,559
Trust preferred securities 308 308
Total liabilities 17,851 16,582
Reported Value Measurement [Member] | U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005)   1,318
Debt securities, held to maturity, net carrying value 1,240  
Reported Value Measurement [Member] | Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005)   1,423
Debt securities, held to maturity, net carrying value 1,266  
Reported Value Measurement [Member] | Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005)   2,349
Debt securities, held to maturity, net carrying value 2,168  
Reported Value Measurement [Member] | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005)   2,331
Debt securities, held to maturity, net carrying value 2,103  
Reported Value Measurement [Member] | Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at September 30, 2020 (fair value – $12,473 and $13,005)   $ 5,160
Debt securities, held to maturity, net carrying value $ 4,874