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Pension Plans, Retirement Benefits and Savings Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Summary of the funded status, obligations and amounts recognized in the consolidated balance sheet for the Company's benefit plans [Table Text Block]
The following tables summarize the funded status, obligations and amounts recognized in the consolidated balance sheet for the Company’s benefit plans. The Company uses a December 31 measurement date for its pension and postretirement benefit plans.
(at and for the year ended December 31,  in millions)Qualified Domestic
Pension Plan		Nonqualified and Foreign
Pension Plans		Total
202420232024202320242023
Change in projected benefit obligation:
Benefit obligation at beginning of year
$3,454 $3,400 $184 $180 $3,638 $3,580 
Benefits earned111 104 5 4 116 108 
Interest cost on benefit obligation163 167 9 9 172 176 
Actuarial (gain) loss(159)123 4 1 (155)124 
Benefits paid(324)(340)(14)(13)(338)(353)
Foreign currency exchange rate change
— — (2)3 (2)3 
Benefit obligation at end of year$3,245 $3,454 $186 $184 $3,431 $3,638 
Change in plan assets:
Fair value of plan assets at beginning of year
$4,149 $3,938 $97 $95 $4,246 $4,033 
Actual return on plan assets409 551 8 (2)417 549 
Company contributions— — 12 13 12 13 
Benefits paid(324)(340)(14)(13)(338)(353)
Foreign currency exchange rate change
— — (3)4 (3)4 
Fair value of plan assets at end
 of year
4,234 4,149 100 97 4,334 4,246 
Funded status of plan at end
 of year
$989 $695 $(86)$(87)$903 $608 
Amounts recognized in the consolidated balance sheet consist of:
Accrued over-funded benefit plan assets
$989 $695 $32 $27 $1,021 $722 
Accrued under-funded benefit plan liabilities
— — (118)(114)(118)(114)
Total$989 $695 $(86)$(87)$903 $608 
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss$381 $663 $14 $13 $395 $676 
Prior service cost (benefit)— — 1 1 1 1 
Total$381 $663 $15 $14 $396 $677 
Postretirement
Benefit Plans
(at and for the year ended December 31, in millions)20242023
Change in accumulated benefit obligation:
Benefit obligation at beginning of year$92 $99 
Benefits earned— — 
Interest cost on benefit obligation4 5 
Actuarial gain(28)(6)
Benefits paid(5)(6)
Foreign currency exchange rate change(1)— 
Benefit obligation at end of year$62 $92 
Change in plan assets:
Fair value of plan assets at beginning of year$7 $8 
Actual return on plan assets— — 
Company contributions4 5 
Benefits paid(5)(6)
Fair value of plan assets at end of year6 7 
Funded status of plan at end of year$(56)$(85)
Amounts recognized in the consolidated balance sheet consist of:
Accrued under-funded benefit plan liability$(56)$(85)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial gain$(110)$(91)
Prior service benefit(4)(8)
Total$(114)$(99)
Summary of the components of net periodic benefit cost (benefit) and other amounts recognized in other comprehensive income (loss) related to the benefit plans [Table Text Block]
The following table summarizes the components of net periodic benefit cost (benefit) and other amounts recognized in other comprehensive income (loss) related to the benefit plans.
Pension PlansPostretirement Benefit
Plans
(for the year ended December 31, in millions)202420232022202420232022
Net Periodic Benefit Cost (Benefit):
Service cost$116 $108 $145 $— $— $— 
Non-service cost (benefit):
Interest cost on benefit obligation172 176 101 4 5 3 
Expected return on plan assets(298)(311)(296)— — — 
Amortization of unrecognized:
Prior service benefit— (1)(1)(3)(3)(3)
Net actuarial (gain) loss7 — 49 (9)(9)(4)
Total non-service cost (benefit)(119)(136)(147)(8)(7)(4)
Net periodic benefit cost (benefit)(3)(28)(2)(8)(7)(4)
Other Changes in Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss):
Prior service benefit— — — — — — 
Net actuarial (gain) loss(274)(114)174 (28)(6)(45)
Foreign currency exchange rate change— — (2)1 — 1 
Amortization of prior service benefit— 1 1 3 3 3 
Amortization of net actuarial gain (loss)(7)— (49)9 9 4 
Total other changes recognized in other comprehensive income (loss)(281)(113)124 (15)6 (37)
Total other changes recognized in net periodic benefit cost (benefit) and other comprehensive income (loss)$(284)$(141)$122 $(23)$(1)$(41)
The following table indicates the line items in which the respective service cost and non-service cost (benefit) are presented in the consolidated statement of income for the years ended December 31, 2024, 2023 and 2022.
 Pension PlansPostretirement Benefit
Plans
(for the year ended December 31, in millions)202420232022202420232022
Service Cost:
Net investment income$1 $— $1 $— $— $— 
Claims and claim adjustment expenses45 44 58 — — — 
General and administrative expenses70 64 86 — — — 
Total service cost116 108 145 — — — 
Non-Service Cost (Benefit):
Net investment income(1)(1)(1)— — — 
Claims and claim adjustment expenses(45)(54)(59)(3)(3)(2)
General and administrative expenses(73)(81)(87)(5)(4)(2)
Total non-service cost (benefit)(119)(136)(147)(8)(7)(4)
Net periodic benefit cost (benefit)$(3)$(28)$(2)$(8)$(7)$(4)
Benefit obligations assumptions, net periodic benefit cost assumptions and health care cost trend rates [Table Text Block]
The following table summarizes assumptions used with regard to the Company’s qualified and nonqualified domestic pension plans and the domestic postretirement benefit plans.
(at and for the year ended December 31,)20242023
Assumptions used to determine benefit obligations
Discount rate:
Qualified domestic pension plan5.69 %5.02 %
Nonqualified domestic pension plan5.51 %4.94 %
Domestic postretirement benefit plan5.48 %4.88 %
Cash balance interest crediting rate4.01 %4.01 %
Future compensation increase rate4.00 %4.00 %
Assumptions used to determine net periodic benefit cost
Discount rate:
Qualified domestic pension plan:
Service cost5.10 %5.27 %
Interest cost4.91 %5.18 %
Nonqualified domestic pension plan:
Service cost4.98 %5.16 %
Interest cost4.86 %5.11 %
Domestic postretirement benefit plan:
Interest cost4.84 %5.03 %
Expected long-term rate of return on assets:
Qualified domestic pension plan7.00 %7.00 %
Domestic postretirement benefit plan4.00 %4.00 %
Assumed health care cost trend rates (1)
Following year(18.04)%(2.78)%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)4.50 %4.50 %
Year that the rate reaches the ultimate trend rate20332033
___________________________________________
(1)The 2025 assumed health care cost trend rate of (18.04)% reflects known negotiated medical premium rate changes and expected drug reimbursements to the Company’s baseline health care cost trend rate of 10.00%. After 2025, assumed health care cost trend rates are expected to increase in the subsequent year and then are expected to decrease in a linear pattern until the rate reaches the ultimate trend rate of 4.50% in 2033. The 2024 assumed health care cost trend rate of (2.78)% reflects known negotiated medical premium rate changes to the Company’s baseline health care cost trend rate of 8.00%.
Level within the fair value hierarchy at which the financial assets of the Company's pension plans are measured [Table Text Block]
The following tables present the level within the fair value hierarchy at which the financial assets of the Company’s pension plans are measured on a recurring basis.
(at December 31, 2024, in millions)TotalLevel 1Level 2Level 3
Invested assets:
Fixed maturities
Obligations of U.S. states, municipalities and political subdivisions$109 $— $109 $— 
Debt securities issued by foreign governments34 — 34 — 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
8 — 8 — 
Corporate and all other bonds751 — 751 — 
Total fixed maturities902 — 902 — 
Mutual funds
Equity mutual funds1,178 1,172 6 — 
Bond mutual funds667 636 31 — 
Total mutual funds1,845 1,808 37 — 
Equity securities1,401 1,401 — — 
Other investments 1 — — 1 
Cash and short-term securities
U.S. Treasury securities108 108 — — 
Other77 62 15 — 
Total cash and short-term securities185 170 15 — 
Total$4,334 $3,379 $954 $1 
(at December 31, 2023, in millions)TotalLevel 1Level 2Level 3
Invested assets:
Fixed maturities
Obligations of U.S. states, municipalities and political subdivisions$105 $— $105 $— 
Debt securities issued by foreign governments32 — 32 — 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
8 — 8 — 
Corporate and all other bonds776 — 776 — 
Total fixed maturities921 — 921 — 
Mutual funds
Equity mutual funds1,207 1,201 6 — 
Bond mutual funds658 655 3 — 
Total mutual funds1,865 1,856 9 — 
Equity securities1,302 1,302 — — 
Other investments 1 — — 1 
Cash and short-term securities
U.S. Treasury securities— — — — 
Other157 114 43 — 
Total cash and short-term securities157 114 43 — 
Total$4,246 $3,272 $973 $1 
Estimated future benefit payments [Table Text Block]
The following table presents the estimated benefits expected to be paid by the Company’s pension and postretirement benefit plans for the next ten years (reflecting estimated future employee service).
Benefits Expected to be Paid
(in millions)Pension PlansPostretirement Benefit Plans
2025$283 $5 
2026289 6 
2027295 6 
2028299 6 
2029296 6 
2030 through 2034
1,427 27