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v3.20.1

Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Pretax loss on retirement of debt |  | $ 295 |  | $ 0 |
Secured Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Pretax loss on retirement of debt |  | $ 295 |  |  |
6.25% Senior Notes Due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Early Repayment of Senior Debt | $ 1,000 |  |  |  |
Debt Instrument, Redemption Price, Percentage | 6.25% |  |  |  |
7.50% Senior Notes Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Early Repayment of Senior Debt | $ 2,000 |  |  |  |
Debt Instrument, Redemption Price, Percentage | 7.50% |  |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount | $ 2,700 |  |  |  |
Debt instrument, stated interest | 3.50% |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 5.50% |  |  |
Senior Secured Three Six Four Day Term Loan Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 2,000 |  |  |
Debt Instrument, Interest Rate, Basis for Effective Rate |  |  | LIBOR rate plus 2.50% |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 2.50%

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