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Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
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: 

  202020192018
In millionsU.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Service cost$85 $5 $68 $5 $153 $5 
Interest cost393 6 440 8 467 8 
Expected return on plan assets(668)(8)(631)(10)(765)(11)
Actuarial loss (gain)202 2 200 2 337 2 
Amortization of prior service cost20 — 16 — 16 — 
Curtailment loss (gain)— (1)— (1)— — 
Settlement loss— 1 — 2 424 — 
Net periodic pension expense$32 $5 $93 $6 $632 $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 2020, 2019 and 2018 were as follows: 

In millions202020192018
U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Service cost$— $— $— $1 $1 $— 
Interest cost7 2 8 1 8 2 
Actuarial loss5 1 4 2 9 2 
Amortization of prior service credits(1)(2)(2)(3)(2)(3)
Net postretirement expense$11 $1 $10 $1 $16 $1 
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, 2020, 2019 and 2018 were as follows: 

202020192018
U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Discount rate3.30 %7.15 %4.20 %9.10 %3.50 %9.38 %

The weighted average assumptions used to determine the benefit obligation at December 31, 2020 and 2019 were as follows: 

20202019
U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Discount rate2.50 %6.91 %3.30 %7.15 %
Health care cost trend rate assumed for next year6.50 %8.56 %6.75 %9.57 %
Rate that the cost trend rate gradually declines to5.00 %4.23 %5.00 %4.78 %
Year that the rate reaches the rate it is assumed to remain2026203120262030
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 2020 and 2019: 

In millions20202019
U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Change in projected benefit obligation:
Benefit obligation, January 1$214 $31 $213 $24 
Service cost— — — 1 
Interest cost7 2 8 1 
Participants’ contributions3 — 4 — 
Actuarial (gain) loss4 1 20 8 
Benefits paid(28)(1)(32)(2)
Less: Federal subsidy1 — 1 — 
Divestiture— (7)— — 
Currency Impact— (6)— (1)
Benefit obligation, December 31$201 $20 $214 $31 
Change in plan assets:
Fair value of plan assets, January 1$— $— $— $— 
Company contributions25 1 28 2 
Participants’ contributions3 — 4 — 
Benefits paid(28)(1)(32)(2)
Fair value of plan assets, December 31$— $— $— $— 
Funded status, December 31$(201)$(20)$(214)$(31)
Amounts recognized in the consolidated balance sheet under ASC 715:
Current liability$(18)$— $(21)$(1)
Non-current liability(183)(20)(193)(30)
 $(201)$(20)$(214)$(31)
Amounts recognized in accumulated other comprehensive income under ASC 715 (pre-tax):
Net actuarial loss (gain)$46 $12 $47 $19 
Prior service credit— (12)(2)(18)
 $46 $— $45 $1 
Postretirement Benefit Adjustments Recognized In Other Comprehensive (Loss) Income [Table Text Block]
The components of the $1 million and ($1) million change in the amounts recognized in OCI during 2020 for U.S. and non-U.S. plans, respectively, consisted of: 

In millionsU.S.
Plans		Non-
U.S.
Plans
Current year actuarial (gain) loss$5 $1 
Amortization of actuarial (loss) gain(5)(1)
Current year prior service cost— — 
Amortization of prior service credit1 2 
Divestitures— (2)
Currency impact— (1)
 $1 $(1)
Estimated Total Future Postretirement Benefit Payments, Net Of Participant Contributions And Estimated Future Medicare Part D Subsidy Receipts [Table Text Block]
At December 31, 2020, 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
2021$20 $1 $— 
202218 1 — 
202317 1 1 
202416 1 1 
202515 1 1 
2026 – 203064 4 5