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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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