v3.22.0.1

Pension and Other Postretirement Benefits - Narrative (Details)				1 Months Ended				3 Months Ended	9 Months Ended	12 Months Ended
	Nov. 30, 2020 participant	Jul. 01, 2020 USD ($) participant	May 31, 2020 participant	Apr. 30, 2021 USD ($) plan participant	Dec. 31, 2020 USD ($) segment participant	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) participant	Jun. 30, 2021 USD ($) plan participant	Sep. 30, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2021 USD ($)	Apr. 01, 2020 USD ($)	Jan. 01, 2020 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement plans, accumulated other comprehensive loss															$ 50,000,000
Noncurrent assets															65,000,000
Noncurrent liability															$ 15,000,000
Weighted average duration of projected plan cash flows under yield curve model											13 years
Cash contributions to pension plans											$ 458,000,000	$ 271,000,000	$ 3,000,000
Defined contribution plan, cost											39,000,000	35,000,000	38,000,000
Accrued pension benefits					$ 1,343,000,000						717,000,000	1,343,000,000
Settlements related to employee retirement benefit plans											(584,000,000)	(199,000,000)	0
Forecast | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected long-term rate of return on plan assets										5.00%
Forecast | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected long-term rate of return on plan assets										6.00%
Funded
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cash contributions to pension plans											458,000,000	271,000,000
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement plans, liability																$ 1,920,000,000
Retirement plan, current liability																60,000,000
Projected benefit obligation																4,255,000,000
Retirement plans, plan asset																2,335,000,000
Retirement plans, accumulated other comprehensive loss																$ 1,752,000,000
Pension benefits​
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement plan, current liability					8,000,000						8,000,000	8,000,000
Projected benefit obligation					4,081,000,000						2,817,000,000	4,081,000,000	142,000,000
Retirement plans, plan asset					2,754,000,000						2,124,000,000	2,754,000,000	$ 79,000,000
Noncurrent assets					24,000,000						32,000,000	24,000,000
Noncurrent liability					$ 1,343,000,000						717,000,000	1,343,000,000
Settlement of plan obligations											(1,051,000,000)	(542,000,000)
Contributions by employer											$ 458,000,000	$ 271,000,000
Defined benefit plan, discount rate					2.45%						2.76%	2.45%
Expected long-term rate of return on plan assets											4.91%	6.09%	6.73%
Settlements related to employee retirement benefit plans											$ (584,000,000)	$ (199,000,000)	$ 0
Pension benefits​ | Funded | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Minimum required contribution to pension plans in 2021										$ 32,000,000
Pension benefits​ | U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation				$ 3,337,000,000	$ 3,646,000,000						2,398,000,000	3,646,000,000
Retirement plans, plan asset				2,790,000,000	$ 2,379,000,000						$ 1,744,000,000	$ 2,379,000,000
Retirement plans, accumulated other comprehensive loss				$ (117,000,000)
Defined benefit plan, number of participants | participant	30,000			8,400	7,000			23,000
Settlement of plan obligations				$ 995,000,000	$ 240,000,000
Defined benefit plan, plan assets, transfer of plan assets				1,007,000,000	245,000,000
Contributions by employer				$ 250,000,000
Defined benefit plan, discount rate				3.10%							2.54%
Settlement charge					(140,000,000)						$ 549,000,000
Settlement charge, after-tax					$ 108,000,000						423,000,000
Number of plans with obligations transferred to insurance company | segment					2
Number of defined benefit pension plans | plan				2				2
Accrued pension benefits				$ 152,000,000
Settlements related to employee retirement benefit plans											549,000,000
Pension benefits​ | U.S. | Funded | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Minimum required contribution to pension plans in 2021										$ 22,000,000
Pension benefits​ | U.K.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation		$ 240,000,000
Retirement plans, plan asset		$ 260,000,000
Defined benefit plan, number of participants | participant		1,050	3,350				1,800
Settlement of plan obligations							$ 400,000,000
Defined benefit plan, plan assets, transfer of plan assets							$ 460,000,000				58,000,000
Contributions by employer								$ 10,000,000
Defined benefit plan, discount rate					2.05%			1.55%				2.05%
Net reduction to remaining plan obligations due to remeasurement of plan									$ 250,000,000
Settlement charge											(58,000,000)
Settlement charge, after-tax											48,000,000
Other postretirement benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement plan, current liability					$ 35,000,000						29,000,000	$ 35,000,000
Projected benefit obligation					514,000,000						440,000,000	514,000,000	1,000,000
Retirement plans, plan asset					0						0	0	$ 0
Noncurrent assets					0						0	0
Noncurrent liability					$ 479,000,000						411,000,000	479,000,000
Settlement of plan obligations											0	0
Contributions by employer											$ 0	$ 0
Defined benefit plan, discount rate					2.61%						2.90%	2.61%
Settlements related to employee retirement benefit plans											$ 0	$ 0
Other postretirement benefits | U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, discount rate					2.61%	2.54%						2.61%	3.17%	2.78%
Net decrease to postretirement benefits liability						$ 7,000,000					$ 34,000,000
Net decrease to Accumulated other comprehensive loss (after-tax)						5,000,000
Decrease in estimated annual benefit payments beginning in 2021						$ 20,000,000								$ (4,000,000)
Health care cost trend rate assumed for next year					7.70%						4.50%	7.70%
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax											$ 26,000,000
Other postretirement benefits | U.S. | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate assumed for next year										4.50%

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