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Accumulated Other Comprehensive Loss - Tax Impact (Detail) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Outstanding derivatives |  | $ 0
Treasury rate lock [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Interest rate derivative asset notional amount | $ 400 | 500
Cash received on derivative | $ 1 |
Derivative Instruments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications, tax |  | 1
Amounts reclassified from accumulated other comprehensive (income) loss, tax |  | 2
Available for sale Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications, tax |  | 3
Amounts reclassified from accumulated other comprehensive (income) loss, tax |  | 0
Foreign Currency Translation Adjustments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications, tax |  | 0
Amounts reclassified from accumulated other comprehensive (income) loss, tax |  | 0
Post - Retirement Benefit Obligation [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications, tax |  | 0
Amounts reclassified from accumulated other comprehensive (income) loss, tax |  | $ 0

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