Retirement Programs - Pension Plan Asset Fair Value By Category And Level 3 Rollforward (Details) - Pensions - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	$ 9,963
Fair value of plan assets, December 31	10,416	$ 9,963
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,466	1,319
Gain/(Loss) for the period	56	(6)
Purchases	302	158
Sales	(46)	(79)
Transfer into / (out of) Level 3	0	15
Foreign currency translation	(38)	59
Fair value of plan assets, December 31	1,740	1,466
Pool Funds Measured at NAV
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,517
Fair value of plan assets, December 31	2,052	1,517
Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	524
Fair value of plan assets, December 31	259	524
Cash and cash equivalents | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	524
Fair value of plan assets, December 31	259	524
Cash and cash equivalents | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Cash and cash equivalents | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Global equities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,974
Fair value of plan assets, December 31	1,633	1,974
Global equities | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,974
Fair value of plan assets, December 31	1,633	1,974
Global equities | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Global equities | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Mutual funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	324
Fair value of plan assets, December 31	314	324
Mutual funds | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	324
Fair value of plan assets, December 31	314	324
Mutual funds | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31		0
Mutual funds | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Government bonds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,545
Fair value of plan assets, December 31	1,624	1,545
Government bonds | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Government bonds | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,545
Fair value of plan assets, December 31	1,624	1,545
Government bonds | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Emerging market debt | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	520
Fair value of plan assets, December 31	509	520
Emerging market debt | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Emerging market debt | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	520
Fair value of plan assets, December 31	509	520
Emerging market debt | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Mutual funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	135
Fair value of plan assets, December 31	133	135
Mutual funds | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	123
Fair value of plan assets, December 31	121	123
Mutual funds | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	12
Fair value of plan assets, December 31	12	12
Mutual funds | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Corporate bonds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	573
Fair value of plan assets, December 31	647	573
Corporate bonds | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Corporate bonds | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	573
Fair value of plan assets, December 31	647	573
Corporate bonds | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Bank loans | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	242
Fair value of plan assets, December 31	253	242
Bank loans | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Bank loans | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	242
Fair value of plan assets, December 31	253	242
Bank loans | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Real estate funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	335
Fair value of plan assets, December 31	360	335
Real estate funds | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Real estate funds | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Real estate funds | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	335	316
Gain/(Loss) for the period	27	(10)
Purchases	13	21
Sales	(4)	(10)
Transfer into / (out of) Level 3	(1)	4
Foreign currency translation	(10)	14
Fair value of plan assets, December 31	360	335
Private debt | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,120
Fair value of plan assets, December 31	1,368	1,120
Private debt | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Private debt | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1
Fair value of plan assets, December 31	0
Private debt | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,120	1,003
Gain/(Loss) for the period	28	4
Purchases	289	137
Sales	(42)	(69)
Transfer into / (out of) Level 3	0	0
Foreign currency translation	(27)	45
Fair value of plan assets, December 31	1,368	1,120
Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	11
Fair value of plan assets, December 31	12	11
Insurance contracts | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Insurance contracts | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Insurance contracts | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	11
Gain/(Loss) for the period	1
Purchases	0	0
Sales	0	0
Transfer into / (out of) Level 3	1	11
Foreign currency translation	(1)	0
Fair value of plan assets, December 31	12	11
Liquid alternative | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,083
Fair value of plan assets, December 31	1,193	1,083
Liquid alternative | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Liquid alternative | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,083
Fair value of plan assets, December 31	1,193	1,083
Liquid alternative | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Other investments | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	60
Fair value of plan assets, December 31	59	60
Other investments | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	1	0
Other investments | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	60
Fair value of plan assets, December 31	58	60
Other investments | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	0
Fair value of plan assets, December 31	0	0
Total pension assets, by level | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	8,446
Fair value of plan assets, December 31	8,364	8,446
Total pension assets, by level | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	2,945
Fair value of plan assets, December 31	2,328	2,945
Total pension assets, by level | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	4,035
Fair value of plan assets, December 31	4,296	4,035
Total pension assets, by level | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,466
Fair value of plan assets, December 31	$ 1,740	$ 1,466