Employee Benefit Obligations - Fair Value of Assets (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension assets at fair value
Total assets.	$ 3,405	$ 5,490	$ 5,838
United States
Pension assets at fair value
Total assets.	1,417	1,960	2,085
United States | Fair Value Inputs Level 1 And Level 2
Pension assets at fair value
Total assets.	540	788
United States | Fair Value Inputs Level 1 And Level 2 | Cash and cash equivalents
Pension assets at fair value
Total assets.	13	26
United States | Fair Value Inputs Level 1 And Level 2 | Municipal bonds
Pension assets at fair value
Total assets.	11	25
United States | Fair Value Inputs Level 1 And Level 2 | Treasury bonds
Pension assets at fair value
Total assets.	147	106
United States | Fair Value Inputs Level 1 And Level 2 | US Government and Government Agencies - Other
Pension assets at fair value
Total assets.	4	7
United States | Fair Value Inputs Level 1 And Level 2 | Non-U.S. government bonds
Pension assets at fair value
Total assets.	11	20
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Basic materials
Pension assets at fair value
Total assets.	4	5
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Communications
Pension assets at fair value
Total assets.	18	34
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Consumer discretionary
Pension assets at fair value
Total assets.	6	20
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Consumer staples
Pension assets at fair value
Total assets.	17	41
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Energy
Pension assets at fair value
Total assets.	12	23
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Financials
Pension assets at fair value
Total assets.	99	86
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Industrials
Pension assets at fair value
Total assets.	140	283
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Information technology
Pension assets at fair value
Total assets.	8	12
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Private placement
Pension assets at fair value
Total assets.	1	1
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Utilities
Pension assets at fair value
Total assets.	49	98
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Other
Pension assets at fair value
Total assets.		1
United States | Level 1
Pension assets at fair value
Total assets.	147	106
United States | Level 1 | Treasury bonds
Pension assets at fair value
Total assets.	147	106
United States | Level 2
Pension assets at fair value
Total assets.	393	682
United States | Level 2 | Cash and cash equivalents
Pension assets at fair value
Total assets.	13	26
United States | Level 2 | Municipal bonds
Pension assets at fair value
Total assets.	11	25
United States | Level 2 | US Government and Government Agencies - Other
Pension assets at fair value
Total assets.	4	7
United States | Level 2 | Non-U.S. government bonds
Pension assets at fair value
Total assets.	11	20
United States | Level 2 | Corporate bonds and notes-Basic materials
Pension assets at fair value
Total assets.	4	5
United States | Level 2 | Corporate bonds and notes-Communications
Pension assets at fair value
Total assets.	18	34
United States | Level 2 | Corporate bonds and notes-Consumer discretionary
Pension assets at fair value
Total assets.	6	20
United States | Level 2 | Corporate bonds and notes-Consumer staples
Pension assets at fair value
Total assets.	17	41
United States | Level 2 | Corporate bonds and notes-Energy
Pension assets at fair value
Total assets.	12	23
United States | Level 2 | Corporate bonds and notes-Financials
Pension assets at fair value
Total assets.	99	86
United States | Level 2 | Corporate bonds and notes-Industrials
Pension assets at fair value
Total assets.	140	283
United States | Level 2 | Corporate bonds and notes-Information technology
Pension assets at fair value
Total assets.	8	12
United States | Level 2 | Corporate bonds and notes-Private placement
Pension assets at fair value
Total assets.	1	1
United States | Level 2 | Corporate bonds and notes-Utilities
Pension assets at fair value
Total assets.	49	98
United States | Level 2 | Corporate bonds and notes-Other
Pension assets at fair value
Total assets.		1
United States | NAV
Pension assets at fair value
Total assets.	877	1,172
Non U.S.
Pension assets at fair value
Total assets.	1,988	3,530	$ 3,753
U.K.
Pension assets at fair value
Total assets.	1,936	3,456
U.K. | Level 1
Pension assets at fair value
Total assets.	1,192	2,512
U.K. | Level 1 | Cash and cash equivalents
Pension assets at fair value
Total assets.	29	5
U.K. | Level 1 | Equity commingled funds
Pension assets at fair value
Total assets.	51	7
U.K. | Level 1 | U.K. government bonds
Pension assets at fair value
Total assets.	1,092	2,493
U.K. | Level 1 | Other
Pension assets at fair value
Total assets.	20	7
U.K. | Level 2 | Corporate bonds and notes
Pension assets at fair value
Total assets.	688	844
U.K. | NAV | Investment funds - property
Pension assets at fair value
Total assets.	$ 56	$ 100