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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jan. 31, 2019
Debt Instrument [Line Items]
Pretax loss on retirement of debt		$ 211	$ 9	$ 211	$ 9
5.625% Senior Notes Due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount						$ 1,000	$ 500
Debt instrument, stated interest							5.625%
5.875% Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount						$ 2,000	$ 1,000
Debt instrument, stated interest							5.875%
4.250% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Early Repayment of Senior Debt	$ 600
Debt Instrument, Redemption Price, Percentage	4.25%
6.500% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Early Repayment of Senior Debt	$ 3,000
Debt Instrument, Redemption Price, Percentage	6.50%
5.875% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Early Repayment of Senior Debt	$ 1,350
Debt Instrument, Redemption Price, Percentage	5.875%
Secured Debt [Member]
Debt Instrument [Line Items]
Pretax loss on retirement of debt		$ 211
4.13% Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest						4.13%
5.13% Senior Notes Due 2039 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest						5.13%
5.25% Senior Notes Due 2049 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest		5.25%		5.25%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount						$ 5,000	$ 1,500

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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