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Employee Benefit Plans - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2022 | Dec. 31, 2021 USD ($) investment_pool | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution (as percent) |  | 100.00% |  |
Employee contribution (as percent) |  | 1.00% |  |
Employer contribution (as percent) |  | 25.00% |  |
Employer contribution (as percent) |  | 4.00% |  |
Contributions to defined contribution plans |  | $ 58,000,000 | $ 38,000,000 | $ 65,000,000
Subsequent Event |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution (as percent) | 100.00% |  |  |
Employee contribution (as percent) | 1.00% |  |  |
Employer contribution (as percent) | 50.00% |  |  |
Employer contribution (as percent) | 4.00% |  |  |
U.S. and other plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company contribution |  | 0 | 5,000,000 |
Plan assets investments |  | 183,000,000 | 181,000,000 | 167,000,000
U.K. plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company contribution |  | $ 0 | 0 |
Number of plan asset investment pools | investment_pool |  | 2 |  |
Plan assets investments |  | $ 983,000,000 | 974,000,000 | $ 860,000,000
U.K. plan | On-risk assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets target allocation percentage |  | 20.00% |  |
U.K. plan | Off-risk assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets target allocation percentage |  | 80.00% |  |
U.S. Plan | On-risk assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets target allocation percentage |  | 39.00% |  |
U.S. Plan | Off-risk assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets target allocation percentage |  | 61.00% |  |
Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets investments |  | $ 158,000,000 | $ 227,000,000 |

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