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Pension Plans, Retirement Benefits and Savings Plans (Tables)
 12 Months Ended
Dec. 31, 2023
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
202320222023202220232022
Change in projected benefit obligation:
Benefit obligation at beginning of year
$3,400 $4,212 $180 $259 $3,580 $4,471 
Benefits earned104 137 4 8 108 145 
Interest cost on benefit obligation167 95 9 6 176 101 
Actuarial (gain) loss123 (781)1 (64)124 (845)
Benefits paid(340)(263)(13)(14)(353)(277)
Settlement— — — (3)— (3)
Foreign currency exchange rate change
— — 3 (12)3 (12)
Benefit obligation at end of year$3,454 $3,400 $184 $180 $3,638 $3,580 
Change in plan assets:
Fair value of plan assets at beginning of year
$3,938 $4,902 $95 $134 $4,033 $5,036 
Actual return on plan assets551 (701)(2)(22)549 (723)
Company contributions— — 13 13 13 13 
Benefits paid(340)(263)(13)(14)(353)(277)
Settlement— — — (3)— (3)
Foreign currency exchange rate change
— — 4 (13)4 (13)
Fair value of plan assets at end
 of year
4,149 3,938 97 95 4,246 4,033 
Funded status of plan at end
 of year
$695 $538 $(87)$(85)$608 $453 
Amounts recognized in the consolidated balance sheet consist of:
Accrued over-funded benefit plan assets
$695 $538 $27 $23 $722 $561 
Accrued under-funded benefit plan liabilities
— — (114)(108)(114)(108)
Total$695 $538 $(87)$(85)$608 $453 
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss$663 $785 $13 $5 $676 $790 
Prior service cost (benefit)— (1)1 1 1 — 
Total$663 $784 $14 $6 $677 $790 
Postretirement
Benefit Plans
(at and for the year ended December 31, in millions)20232022
Change in accumulated benefit obligation:
Benefit obligation at beginning of year$99 $149 
Benefits earned— — 
Interest cost on benefit obligation5 3 
Actuarial gain(6)(45)
Benefits paid(6)(7)
Foreign currency exchange rate change— (1)
Benefit obligation at end of year$92 $99 
Change in plan assets:
Fair value of plan assets at beginning of year$8 $9 
Actual return on plan assets— — 
Company contributions5 6 
Benefits paid(6)(7)
Fair value of plan assets at end of year7 8 
Funded status of plan at end of year$(85)$(91)
Amounts recognized in the consolidated balance sheet consist of:
Accrued under-funded benefit plan liability$(85)$(91)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial gain$(91)$(94)
Prior service benefit(8)(11)
Total$(99)$(105)
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)202320222021202320222021
Net Periodic Benefit Cost (Benefit):
Service cost$108 $145 $141 $— $— $— 
Non-service cost (benefit):
Interest cost on benefit obligation176 101 83 5 3 3 
Expected return on plan assets(311)(296)(274)— — — 
Amortization of unrecognized:
Prior service benefit(1)(1)(1)(3)(3)(4)
Net actuarial (gain) loss— 49 109 (9)(4)(2)
Total non-service cost (benefit)(136)(147)(83)(7)(4)(3)
Net periodic benefit cost (benefit)(28)(2)58 (7)(4)(3)
Other Changes in Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss):
Prior service benefit— — — — — — 
Net actuarial (gain) loss(114)174 (338)(6)(45)(16)
Foreign currency exchange rate change— (2)— — 1 — 
Amortization of prior service benefit1 1 1 3 3 4 
Amortization of net actuarial gain (loss)— (49)(109)9 4 2 
Total other changes recognized in other comprehensive income (loss)(113)124 (446)6 (37)(10)
Total other changes recognized in net periodic benefit cost (benefit) and other comprehensive income (loss)$(141)$122 $(388)$(1)$(41)$(13)
Consolidated statement of income line items impacted by service costs and non-service cost (benefit) [Table Text Block]
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, 2023, 2022 and 2021.
 Pension PlansPostretirement Benefit
Plans
(for the year ended December 31, in millions)202320222021202320222021
Service Cost:
Net investment income$— $1 $1 $— $— $— 
Claims and claim adjustment expenses44 58 57 — — — 
General and administrative expenses64 86 83 — — — 
Total service cost108 145 141 — — — 
Non-Service Cost (Benefit):
Net investment income(1)(1)— — — — 
Claims and claim adjustment expenses(54)(59)(34)(3)(2)(1)
General and administrative expenses(81)(87)(49)(4)(2)(2)
Total non-service cost (benefit)(136)(147)(83)(7)(4)(3)
Net periodic benefit cost (benefit)$(28)$(2)$58 $(7)$(4)$(3)
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,)20232022
Assumptions used to determine benefit obligations
Discount rate:
Qualified domestic pension plan5.02 %5.19 %
Nonqualified domestic pension plan4.94 %5.13 %
Domestic postretirement benefit plan4.88 %5.08 %
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 cost5.27 %3.18 %
Interest cost5.18 %2.34 %
Nonqualified domestic pension plan:
Service cost5.16 %2.92 %
Interest cost5.11 %2.23 %
Domestic postretirement benefit plan:
Interest cost5.03 %2.08 %
Expected long-term rate of return on assets:
Pension plan7.00 %6.50 %
Postretirement benefit plan4.00 %4.00 %
Assumed health care cost trend rates (1)
Following year(2.78)%9.50 %
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 rate20332032
___________________________________________
(1)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%. After 2024, 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.
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, 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 
(at December 31, 2022, in millions)TotalLevel 1Level 2Level 3
Invested assets:
Fixed maturities
Obligations of U.S. states, municipalities and political subdivisions$80 $— $80 $— 
Debt securities issued by foreign governments25 — 25 — 
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
4 — 4 — 
Corporate and all other bonds713 — 713 — 
Total fixed maturities822 — 822 — 
Mutual funds
Equity mutual funds1,157 1,151 6 — 
Bond mutual funds754 751 3 — 
Total mutual funds1,911 1,902 9 — 
Equity securities1,116 1,116 — — 
Other investments 1 — — 1 
Cash and short-term securities
U.S. Treasury securities— — — — 
Other183 131 52 — 
Total cash and short-term securities183 131 52 — 
Total$4,033 $3,149 $883 $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
2024$285 $8 
2025283 8 
2026288 8 
2027290 8 
2028291 8 
2029 through 20331,424 38