Employee Benefit Obligations - Fair Value of Assets (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension assets at fair value
Total assets.	$ 3,476	$ 3,405	$ 5,490
United States
Pension assets at fair value
Total assets.	1,427	1,417	1,960
United States | Fair Value Inputs Level 1 And Level 2
Pension assets at fair value
Total assets.	576	540
United States | Fair Value Inputs Level 1 And Level 2 | Cash and cash equivalents
Pension assets at fair value
Total assets.	42	13
United States | Fair Value Inputs Level 1 And Level 2 | Municipal bonds
Pension assets at fair value
Total assets.	11	11
United States | Fair Value Inputs Level 1 And Level 2 | Treasury bonds
Pension assets at fair value
Total assets.	176	147
United States | Fair Value Inputs Level 1 And Level 2 | US Government and Government Agencies - Other
Pension assets at fair value
Total assets.	11	4
United States | Fair Value Inputs Level 1 And Level 2 | Non-U.S. government bonds
Pension assets at fair value
Total assets.	14	11
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Basic materials
Pension assets at fair value
Total assets.	6	4
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Communications
Pension assets at fair value
Total assets.	45	18
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Consumer discretionary
Pension assets at fair value
Total assets.	19	6
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Consumer staples
Pension assets at fair value
Total assets.	62	17
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Energy
Pension assets at fair value
Total assets.	39	12
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Financials
Pension assets at fair value
Total assets.	46	99
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Industrials
Pension assets at fair value
Total assets.	41	140
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Information technology
Pension assets at fair value
Total assets.	6	8
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.	57	49
United States | Level 1
Pension assets at fair value
Total assets.	176	147
United States | Level 1 | Treasury bonds
Pension assets at fair value
Total assets.	176	147
United States | Level 2
Pension assets at fair value
Total assets.	400	393
United States | Level 2 | Cash and cash equivalents
Pension assets at fair value
Total assets.	42	13
United States | Level 2 | Municipal bonds
Pension assets at fair value
Total assets.	11	11
United States | Level 2 | US Government and Government Agencies - Other
Pension assets at fair value
Total assets.	11	4
United States | Level 2 | Non-U.S. government bonds
Pension assets at fair value
Total assets.	14	11
United States | Level 2 | Corporate bonds and notes-Basic materials
Pension assets at fair value
Total assets.	6	4
United States | Level 2 | Corporate bonds and notes-Communications
Pension assets at fair value
Total assets.	45	18
United States | Level 2 | Corporate bonds and notes-Consumer discretionary
Pension assets at fair value
Total assets.	19	6
United States | Level 2 | Corporate bonds and notes-Consumer staples
Pension assets at fair value
Total assets.	62	17
United States | Level 2 | Corporate bonds and notes-Energy
Pension assets at fair value
Total assets.	39	12
United States | Level 2 | Corporate bonds and notes-Financials
Pension assets at fair value
Total assets.	46	99
United States | Level 2 | Corporate bonds and notes-Industrials
Pension assets at fair value
Total assets.	41	140
United States | Level 2 | Corporate bonds and notes-Information technology
Pension assets at fair value
Total assets.	6	8
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.	57	49
United States | NAV
Pension assets at fair value
Total assets.	851	877
Non U.S.
Pension assets at fair value
Total assets.	2,049	1,988	$ 3,530
U.K.
Pension assets at fair value
Total assets.	1,990	1,936
U.K. | Insurance annuity contract
Pension assets at fair value
Annuity buy-in contract	1,940
U.K. | Level 1
Pension assets at fair value
Total assets.	55	1,192
U.K. | Level 1 | Cash and cash equivalents
Pension assets at fair value
Total assets.	31	29
U.K. | Level 1 | Equity commingled funds
Pension assets at fair value
Total assets.	20	51
U.K. | Level 1 | U.K. government bonds
Pension assets at fair value
Total assets.		1,092
U.K. | Level 1 | Other
Pension assets at fair value
Total assets.	4	20
U.K. | Level 2 | Corporate bonds and notes
Pension assets at fair value
Total assets.		688
U.K. | Level 3 | Insurance annuity contract
Pension assets at fair value
Total assets.	$ 1,935
U.K. | NAV | Investment funds - property
Pension assets at fair value
Total assets.		$ 56