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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Jan. 31, 2019
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%
4.25% Senior Notes Due 2019 [Member] | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Early Repayment of Senior Debt | $ 600 |  |  |
Debt Instrument, Redemption Price, Percentage | 4.25% |  |  |
6.50% Senior Notes Due 2020 [Member] | Subsequent Event [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] | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Early Repayment of Senior Debt | $ 1,350 |  |  |
Debt Instrument, Redemption Price, Percentage | 5.875% |  |  |
Secured Debt [Member] | Subsequent Event [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% |
Senior Unsecured Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, principal amount |  |  | $ 5,000 | $ 1,500

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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