Retirement Programs - Pension Plan Asset Fair Value By Category And Level 3 Rollforward (Details) - Pensions - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	$ 7,685
Fair value of plan assets, December 31	8,228	$ 7,685
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,759	1,740
Gain/(Loss) for the period	(65)	98
Purchases	5	83
Sales	(59)	(56)
Transfer into / (out of) Level 3	0	33
Foreign currency translation	80	(139)
Fair value of plan assets, December 31	1,720	1,759
Pool Funds Measured at NAV
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,457
Fair value of plan assets, December 31	1,572	1,457
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	313
Fair value of plan assets, December 31	368	313
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	313
Fair value of plan assets, December 31	368	313
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	778
Fair value of plan assets, December 31	926	778
Global equities | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	778
Fair value of plan assets, December 31	926	778
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	248
Fair value of plan assets, December 31	298	248
Mutual funds | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	248
Fair value of plan assets, December 31	298	248
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	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	1,317
Fair value of plan assets, December 31	1,486	1,317
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	1,317
Fair value of plan assets, December 31	1,486	1,317
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	245
Fair value of plan assets, December 31	283	245
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	245
Fair value of plan assets, December 31	283	245
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	156
Fair value of plan assets, December 31	179	156
Mutual funds | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	101
Fair value of plan assets, December 31	119	101
Mutual funds | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	55
Fair value of plan assets, December 31	60	55
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	372
Fair value of plan assets, December 31	324	372
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	372
Fair value of plan assets, December 31	324	372
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	18
Fair value of plan assets, December 31	27	18
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	18
Fair value of plan assets, December 31	27	18
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	353
Fair value of plan assets, December 31	324	353
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	353	360
Gain/(Loss) for the period	(27)	5
Purchases	3	18
Sales	(15)	(22)
Transfer into / (out of) Level 3	0	0
Foreign currency translation	10	(8)
Fair value of plan assets, December 31	324	353
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	1,360
Fair value of plan assets, December 31	1,345	1,360
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	0
Fair value of plan assets, December 31	0	0
Private debt | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1,360	1,368
Gain/(Loss) for the period	(38)	93
Purchases	1	63
Sales	(44)	(34)
Transfer into / (out of) Level 3	0	0
Foreign currency translation	66	(130)
Fair value of plan assets, December 31	1,345	1,360
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	46
Fair value of plan assets, December 31	51	46
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	46	12
Gain/(Loss) for the period	0	0
Purchases	1	2
Sales	0	0
Transfer into / (out of) Level 3	0	33
Foreign currency translation	4	(1)
Fair value of plan assets, December 31	51	46
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	982
Fair value of plan assets, December 31	1,022	982
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	982
Fair value of plan assets, December 31	1,022	982
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	40
Fair value of plan assets, December 31	23	40
Other investments | Level 1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	1
Fair value of plan assets, December 31	1	1
Other investments | Level 2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, January 1	39
Fair value of plan assets, December 31	22	39
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	6,228
Fair value of plan assets, December 31	6,656	6,228
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	1,441
Fair value of plan assets, December 31	1,712	1,441
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	3,028
Fair value of plan assets, December 31	3,224	3,028
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	1,759
Fair value of plan assets, December 31	$ 1,720	$ 1,759