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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value $ 12,471 $ 13,005
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005) 12,070 12,581
Debt securities, held to maturity, net carrying value 12,025  
Repurchase agreements 1,408 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term debt 1,300 1,299
Long-term debt 13,510 13,559
Total liabilities 120,930 121,612
U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,283 1,347
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005) 1,208 1,318
Debt securities, held to maturity, net carrying value 1,208  
Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,343 1,485
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005) 1,294 1,423
Debt securities, held to maturity, net carrying value 1,287  
Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,322 2,468
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005) 2,272 2,349
Debt securities, held to maturity, net carrying value 2,236  
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,367 2,396
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005) 2,266 2,331
Debt securities, held to maturity, net carrying value 2,265  
States, municipalities, and political subdivisions    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 5,156 5,309
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005) 5,030 5,160
Debt securities, held to maturity, net carrying value 5,029  
Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,227 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 and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,227 1,292
Level 1 | Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 1 | Corporate 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 | States, municipalities, and political subdivisions    
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 11,216 11,681
Repurchase agreements 1,408 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term Debt, Fair Value 1,300 1,307
Long-term Debt, Fair Value 14,353 15,048
Trust preferred securities 406 467
Total liabilities 17,467 18,238
Level 2 | U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 56 55
Level 2 | Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,343 1,485
Level 2 | Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,294 2,436
Level 2 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,367 2,396
Level 2 | States, municipalities, and political subdivisions    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 5,156 5,309
Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 28 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 and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 3 | Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 3 | Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 28 32
Level 3 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 0 0
Level 3 | States, municipalities, and political subdivisions    
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 12,471 13,005
Repurchase agreements 1,408 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term Debt, Fair Value 1,300 1,307
Long-term Debt, Fair Value 14,353 15,048
Trust preferred securities 406 467
Total liabilities 17,467 18,238
Estimate of Fair Value Measurement [Member] | U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,283 1,347
Estimate of Fair Value Measurement [Member] | Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 1,343 1,485
Estimate of Fair Value Measurement [Member] | Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,322 2,468
Estimate of Fair Value Measurement [Member] | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 2,367 2,396
Estimate of Fair Value Measurement [Member] | States, municipalities, and political subdivisions    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held-to-maturity, Fair Value 5,156 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 March 31, 2020 (fair value – $12,471 and $13,005)   12,581
Debt securities, held to maturity, net carrying value 12,025  
Repurchase agreements 1,408 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Short-term debt 1,300 1,299
Long-term debt 13,510 13,559
Trust preferred securities 308 308
Total liabilities 16,526 16,582
Reported Value Measurement [Member] | U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005)   1,318
Debt securities, held to maturity, net carrying value 1,208  
Reported Value Measurement [Member] | Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005)   1,423
Debt securities, held to maturity, net carrying value 1,287  
Reported Value Measurement [Member] | Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005)   2,349
Debt securities, held to maturity, net carrying value 2,236  
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 March 31, 2020 (fair value – $12,471 and $13,005)   2,331
Debt securities, held to maturity, net carrying value 2,265  
Reported Value Measurement [Member] | States, municipalities, and political subdivisions    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $45 at March 31, 2020 (fair value – $12,471 and $13,005)   $ 5,160
Debt securities, held to maturity, net carrying value $ 5,029