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Tax - Tax Paid - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of income tax reconciliation [line items] |  |  |
Net tax paid | $ 41 | $ 141 | $ 68
Net tax paid in operating activities | 41 | 141 | 66
Net tax paid in investing activities | 0 | 0 | 2
United States [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Net tax paid | 29 | 80 | 54
Proceeds from income tax refunds | 24 | 0 | 34
United Kingdom [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Net tax paid | 2 | 13 | 23
Proceeds from income tax refunds | $ 0 | $ 0 | $ 11

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