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Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]  
Components Of Postretirement Benefit Expense [Table Text Block]
Net periodic pension expense for qualified and nonqualified U.S. and non-U.S. defined benefit plans comprised the following:

  202320222021
In millionsU.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Service cost$48 $4 $85 $3 $100 $5 
Interest cost459 3 338 2 333 4 
Expected return on plan assets(530)(1)(649)(1)(705)(7)
Actuarial loss (gain)93 (1)87 1 138 2 
Amortization of prior service cost23 — 23 — 22 — 
Special termination benefits1 — — — — — 
Net periodic pension (income) expense$94 $5 $(116)$5 $(112)$4 
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Components Of Postretirement Benefit Expense [Table Text Block]
The components of postretirement benefit expense in 2023, 2022 and 2021 were as follows: 

In millions202320222021
U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Service cost$— $— $— $— $— $— 
Interest cost7 — 5 — 5 1 
Actuarial loss— — 3 — 5 1 
Amortization of prior service credits— — — — — (2)
Net postretirement expense$7 $— $8 $— $10 $— 
Discount Rates Used To Determine Net Cost [Table Text Block]
The discount rates used to determine net U.S. and non-U.S. postretirement benefit cost for the years ended December 31, 2023, 2022 and 2021 were as follows: 

202320222021
U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Discount rate5.50 %5.70 %2.90 %5.20 %2.50 %6.91 %
The weighted average assumptions used to determine the benefit obligation at December 31, 2023 and 2022 were as follows: 

20232022
U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Discount rate5.20 %6.10 %5.50 %5.70 %
Health care cost trend rate assumed for next year7.00 %4.00 %7.25 %4.00 %
Rate that the cost trend rate gradually declines to5.00 %4.00 %5.00 %4.00 %
Year that the rate reaches the rate it is assumed to remain2032202320322023
Changes In Postretirement Benefit Obligation, Plan Assets, Funded Status And Amounts Recognized In Balance Sheet And Accumulated Other Comprehensive (Loss) Income [Table Text Block]
The plans are only funded in an amount equal to benefits paid. The following table presents the changes in benefit obligation and plan assets for 2023 and 2022: 

In millions20232022
U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Change in projected benefit obligation:
Benefit obligation, January 1$125 $4 $172 $5 
Service cost— — — — 
Interest cost7 — 5 — 
Participants’ contributions2 — 3 — 
Actuarial (gain) loss8 — (33)— 
Benefits paid(24)— (23)— 
Less: Federal subsidy— — 1 — 
Currency Impact— — — (1)
Benefit obligation, December 31$118 $4 $125 $4 
Change in plan assets:
Fair value of plan assets, January 1$— $— $— $— 
Company contributions22 — 20 — 
Participants’ contributions2 — 3 — 
Benefits paid(24)— (23)— 
Fair value of plan assets, December 31$— $— $— $— 
Funded status, December 31$(118)$(4)$(125)$(4)
Amounts recognized in the consolidated balance sheet under ASC 715:
Current liability$(13)$— $(15)$— 
Non-current liability(105)(4)(110)(4)
 $(118)$(4)$(125)$(4)
Amounts recognized in accumulated other comprehensive income (loss) under ASC 715 (pre-tax):
Net actuarial loss (gain)$2 $(1)$(6)$(1)
Prior service credit— — — — 
 $2 $(1)$(6)$(1)
Postretirement Benefit Adjustments Recognized In Other Comprehensive (Loss) Income [Table Text Block]
The components of the $8 million and $0 million change in the amounts recognized in other comprehensive income ("OCI") during 2023 for U.S. and non-U.S. plans, respectively, consisted of: 

In millionsU.S.
Plans		Non-
U.S.
Plans
Current year actuarial (gain) loss$8 $— 
Amortization of actuarial (loss) gain— — 
 $8 $— 
Estimated Total Future Postretirement Benefit Payments, Net Of Participant Contributions And Estimated Future Medicare Part D Subsidy Receipts [Table Text Block]
At December 31, 2023, estimated total future postretirement benefit payments, net of participant contributions and estimated future Medicare Part D subsidy receipts, were as follows: 

In millionsBenefit
Payments		Subsidy ReceiptsBenefit
Payments
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
2024$14 $1 $— 
202513 1 — 
202612 1 — 
202711 1 — 
202811 1 — 
2029– 203345 2 1