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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended
	Feb. 29, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020
Debt Instrument [Line Items]
Pretax loss on retirement of debt		$ 0		$ 0	$ 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%			5.50%
Senior Secured Three Six Four Day Term Loan Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 2,000			$ 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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