Employee Benefit Obligations - Fair Value of Assets (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension assets at fair value
Total assets.	$ 5,490	$ 5,838	$ 5,716
United States
Pension assets at fair value
Total assets.	1,960	2,085	2,202
United States | Fair Value Inputs Level 1 And Level 2
Pension assets at fair value
Total assets.	788	859
United States | Fair Value Inputs Level 1 And Level 2 | Cash and cash equivalents
Pension assets at fair value
Total assets.	26	23
United States | Fair Value Inputs Level 1 And Level 2 | Municipal bonds
Pension assets at fair value
Total assets.	25	24
United States | Fair Value Inputs Level 1 And Level 2 | Treasury bonds
Pension assets at fair value
Total assets.	106	53
United States | Fair Value Inputs Level 1 And Level 2 | US Government and Government Agencies - Other
Pension assets at fair value
Total assets.	7	6
United States | Fair Value Inputs Level 1 And Level 2 | Non-U.S. government bonds
Pension assets at fair value
Total assets.	20	19
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Basic materials
Pension assets at fair value
Total assets.	5	17
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Communications
Pension assets at fair value
Total assets.	34	113
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Consumer discretionary
Pension assets at fair value
Total assets.	20	88
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Consumer staples
Pension assets at fair value
Total assets.	41	53
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Energy
Pension assets at fair value
Total assets.	23	114
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Financials
Pension assets at fair value
Total assets.	86	145
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Healthcare
Pension assets at fair value
Total assets.		30
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Industrials
Pension assets at fair value
Total assets.	283	41
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Information technology
Pension assets at fair value
Total assets.	12	25
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.	98	56
United States | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Other
Pension assets at fair value
Total assets.	1	51
United States | Level 1
Pension assets at fair value
Total assets.	106	53
United States | Level 1 | Treasury bonds
Pension assets at fair value
Total assets.	106	53
United States | Level 2
Pension assets at fair value
Total assets.	682	806
United States | Level 2 | Cash and cash equivalents
Pension assets at fair value
Total assets.	26	23
United States | Level 2 | Municipal bonds
Pension assets at fair value
Total assets.	25	24
United States | Level 2 | US Government and Government Agencies - Other
Pension assets at fair value
Total assets.	7	6
United States | Level 2 | Non-U.S. government bonds
Pension assets at fair value
Total assets.	20	19
United States | Level 2 | Corporate bonds and notes-Basic materials
Pension assets at fair value
Total assets.	5	17
United States | Level 2 | Corporate bonds and notes-Communications
Pension assets at fair value
Total assets.	34	113
United States | Level 2 | Corporate bonds and notes-Consumer discretionary
Pension assets at fair value
Total assets.	20	88
United States | Level 2 | Corporate bonds and notes-Consumer staples
Pension assets at fair value
Total assets.	41	53
United States | Level 2 | Corporate bonds and notes-Energy
Pension assets at fair value
Total assets.	23	114
United States | Level 2 | Corporate bonds and notes-Financials
Pension assets at fair value
Total assets.	86	145
United States | Level 2 | Corporate bonds and notes-Healthcare
Pension assets at fair value
Total assets.		30
United States | Level 2 | Corporate bonds and notes-Industrials
Pension assets at fair value
Total assets.	283	41
United States | Level 2 | Corporate bonds and notes-Information technology
Pension assets at fair value
Total assets.	12	25
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.	98	56
United States | Level 2 | Corporate bonds and notes-Other
Pension assets at fair value
Total assets.	1	51
United States | NAV
Pension assets at fair value
Total assets.	1,172	1,226
Non U.S.
Pension assets at fair value
Total assets.	3,530	3,753	$ 3,514
United Kingdom
Pension assets at fair value
Total assets.	3,456	3,685
United Kingdom | Level 1
Pension assets at fair value
Total assets.	2,512	2,679
United Kingdom | Level 1 | Cash and cash equivalents
Pension assets at fair value
Total assets.	5	44
United Kingdom | Level 1 | Equity commingled funds
Pension assets at fair value
Total assets.	7	24
United Kingdom | Level 1 | U.K. government bonds
Pension assets at fair value
Total assets.	2,493	2,572
United Kingdom | Level 1 | Other.
Pension assets at fair value
Total assets.	7	39
United Kingdom | Level 2 | Corporate bonds and notes
Pension assets at fair value
Total assets.	844	904
United Kingdom | NAV | Investment funds - property
Pension assets at fair value
Total assets.	$ 100	$ 102