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Accumulated Other Comprehensive Loss - Tax Impact (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, tax | $ 2 | $ 0 | $ 0
Amounts reclassified from accumulated other comprehensive (income) loss, tax | 2 | 3 | 3
Available for sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, tax | 4 | 5 | 2
Amounts reclassified from accumulated other comprehensive (income) loss, tax | 0 | 0 | 0
Foreign Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive (income) loss, tax | 0 | 0 | 0
Post - Retirement Benefit Obligation [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, tax | 1 | 1 | 1
Amounts reclassified from accumulated other comprehensive (income) loss, tax | $ (1) | $ 0 | $ 0

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