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Long-term Corporate Debt and Borrowing Arrangements (Narrative) (Detail) - USD ($) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Aug. 31, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Jul. 30, 2021 | Apr. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |
Total Capacity |  |  | $ 13,509,000,000 |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total Capacity |  |  |  | $ 1,950,000,000 | $ 1,800,000,000
5.375% Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount issued |  | $ 600,000,000 |  |  |
Debt instrument stated interest percentage |  | 5.375% | 5.375% |  |
10.500% Senior Secured Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest percentage |  | 10.50% | 10.50% |  |
Repayments of debt |  | $ 599,000,000 |  |  |
4.750% Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount issued |  | $ 500,000,000 |  |  |
Debt instrument stated interest percentage |  | 4.75% | 4.75% |  |
6.375 % Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated interest percentage |  | 6.375% |  |  |
Repayments of debt |  | $ 356,000,000 |  |  |
5.250% Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount issued |  |  | $ 235,000,000 |  |
Debt instrument stated interest percentage |  | 5.25% | 5.25% |  |
Repayments of debt | $ 239,000,000 | $ 142,000,000 |  |  |

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