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Investments (Tables)
 9 Months Ended
Sep. 30, 2024
Investments [Abstract]  
Amortized cost and fair value of investments in fixed maturities [Table Text Block]
The amortized cost and fair value of investments in fixed maturities classified as available for sale were as follows:
Amortized CostAllowance for Expected Credit LossesGross UnrealizedFair Value
(at September 30, 2024, in millions)GainsLosses
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities
$6,048 $— $13 $136 $5,925 
Obligations of U.S. states, municipalities and political subdivisions:
Local general obligation18,482 — 100 1,159 17,423 
Revenue9,244 — 59 544 8,759 
State general obligation1,125 — 8 54 1,079 
Pre-refunded832 — 4 1 835 
Total obligations of U.S. states, municipalities and political subdivisions29,683 — 171 1,758 28,096 
Debt securities issued by foreign governments949 — 8 15 942 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
11,880 — 253 134 11,999 
Corporate and all other bonds38,097 — 348 1,422 37,023 
Total$86,657 $— $793 $3,465 $83,985 
 Amortized CostAllowance for Expected Credit LossesGross UnrealizedFair Value
(at December 31, 2023, in millions)GainsLosses
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities
$6,591 $— $8 $231 $6,368 
Obligations of U.S. states, municipalities and political subdivisions: 
Local general obligation18,374 — 90 1,265 17,199 
Revenue9,748 — 52 616 9,184 
State general obligation1,209 — 7 59 1,157 
Pre-refunded963 — 5 2 966 
Total obligations of U.S. states, municipalities and political subdivisions30,294 — 154 1,942 28,506 
Debt securities issued by foreign governments1,035 — 2 31 1,006 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
7,874 — 120 176 7,818 
Corporate and all other bonds35,987 5 187 2,060 34,109 
Total$81,781 $5 $471 $4,440 $77,807 
Cost and fair value of investments in equity securities [Table Text Block]
The cost and fair value of investments in equity securities were as follows:
  
(at September 30, 2024, in millions)CostGross GainsGross LossesFair Value
Common stock$501 $158 $7 $652 
Non-redeemable preferred stock46 4 — 50 
Total$547 $162 $7 $702 
(at December 31, 2023, in millions)CostGross GainsGross LossesFair Value
Common stock$508 $93 $41 $560 
Non-redeemable preferred stock45 3 — 48 
Total$553 $96 $41 $608 
Unrealized investment losses [Table Text Block]
The following tables summarize, for all fixed maturities classified as available for sale in an unrealized loss position at September 30, 2024 and December 31, 2023, the aggregate fair value and gross unrealized loss by the length of time those securities have been continuously in an unrealized loss position.  The fair value amounts reported in the tables are estimates that are prepared using the process described in note 4 herein and in note 4 of the notes to the consolidated financial statements in the Company’s 2023 Annual Report.  The Company also relies upon estimates of several factors in its review and evaluation of individual investments, using the process described in note 1 of the notes to the consolidated financial statements in the Company’s 2023 Annual Report to determine whether a credit loss impairment exists.
Less than 12 months12 months or longerTotal
(at September 30, 2024, in millions)Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
Fixed maturities      
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities
$105 $— $3,052 $136 $3,157 $136 
Obligations of U.S. states, municipalities and political subdivisions1,771 8 15,819 1,750 17,590 1,758 
Debt securities issued by foreign governments
13 — 539 15 552 15 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
523 3 1,527 131 2,050 134 
Corporate and all other bonds927 5 23,413 1,417 24,340 1,422 
Total $3,339 $16 $44,350 $3,449 $47,689 $3,465 
Less than 12 months12 months or longerTotal
(at December 31, 2023, in millions)Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
Fixed maturities  
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities
$1,864 $7 $2,985  $224 $4,849 $231 
Obligations of U.S. states, municipalities and political subdivisions3,868 31 14,351  1,911 18,219 1,942 
Debt securities issued by foreign governments
30 — 763  31 793 31 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
1,215 9 1,433  167 2,648 176 
Corporate and all other bonds1,016 9 26,444  2,051 27,460 2,060 
Total $7,993 $56 $45,976 $4,384 $53,969 $4,440 
Gross unrealized investment losses on securities continuously in an unrealized loss position of greater than 20% of amortized cost by length of time [Table Text Block]
The following tables summarize, for all fixed maturities reported at fair value for which fair value was less than 80% of amortized cost at September 30, 2024 and December 31, 2023, the gross unrealized investment loss by length of time those securities have continuously been in an unrealized loss position of greater than 20% of amortized cost:
Period For Which Fair Value is Less Than 80% of Amortized Cost
(at September 30, 2024, in millions)3 months or lessGreater than 3 months, 6 months or lessGreater than 6 months, 12 months or lessGreater than 12 monthsTotal
Fixed maturities
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities
$— $— $— $— $— 
Obligations of U.S. states, municipalities and political subdivisions— — 48 581 629 
Debt securities issued by foreign governments
— — — — — 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
— — — — — 
Corporate and all other bonds— — 2 3 5 
Total$— $— $50 $584 $634 
 Period For Which Fair Value is Less Than 80% of Amortized Cost
(at December 31, 2023, in millions)3 months or lessGreater than 3 months, 6 months or lessGreater than 6 months, 12 months or lessGreater than 12 monthsTotal
Fixed maturities
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities
$— $— $— $— $— 
Obligations of U.S. states, municipalities and political subdivisions— 2 31 642 675 
Debt securities issued by foreign governments
— — — — — 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
— — — — — 
Corporate and all other bonds1 3 22 25 51 
Total$1 $5 $53 $667 $726 
Changes in the allowance for expected credit losses on fixed maturities classified as available for sale [Table Text Block]
The following tables present changes in the allowance for expected credit losses on fixed maturities classified as available for sale for the category of Corporate and All Other Bonds (no other categories of fixed maturities currently have an allowance for expected credit losses):
Fixed Maturities
Corporate and All Other Bonds
At and For the Three Months Ended
(in millions)September 30, 2024 September 30, 2023
Balance, beginning of period$1 $4 
Additions for expected credit losses on securities where no credit losses were previously recognized— — 
Additions (reductions) for expected credit losses on securities where credit losses were previously recognized(1)— 
Reductions due to sales/defaults of credit-impaired securities— — 
Reductions for impairments of securities which the Company intends to sell or more likely than not will be required to sell— — 
Balance, end of period$— $4 
Fixed Maturities
Corporate and All Other Bonds
At and For the Nine Months Ended
(in millions)September 30, 2024September 30, 2023
Balance, beginning of period$5 $3 
Additions for expected credit losses on securities where no credit losses were previously recognized3 — 
Additions (reductions) for expected credit losses on securities where credit losses were previously recognized(1)1 
Reductions due to sales/defaults of credit-impaired securities(7)— 
Reductions for impairments of securities which the Company intends to sell or more likely than not will be required to sell— — 
Balance, end of period$— $4