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Financing - Additional Information (Detail) - USD ($) | 1 Months Ended | 8 Months Ended |
--- | --- | --- | ---
Apr. 18, 2019 | May 04, 2019 | Aug. 25, 2018
Debt Instrument [Line Items] |  |  |
Remaining borrowing capacity under revolving credit facility |  | $ 1,997,000,000 |
Amount available under credit facility |  | 2,000,000,000 |
Fair value of the Company's debt |  | 5,190,000,000 | $ 4,948,000,000
Excess (shortfall) of fair value of debt over (from) carrying value |  | 37,900,000 | 57,500,000
Third Amended and Restated Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Amount available under credit facility |  | 1,600,000,000 |
Master Extension Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Amount available under credit facility |  | 2,000,000,000 |
Revolving credit agreement, available additional borrowing capacity |  | 400,000,000 |
Maximum amount available under credit facility |  | $ 2,400,000,000 |
Credit facility expiration date |  | Nov. 18, 2022 |
Credit Agreement description |  | Under the Revolving Credit Agreement, the Company may borrow funds consisting of Eurodollar loans, base rate loans or a combination of both. Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable percentage, as defined in the Revolving Credit Agreement, depending upon the Company’s senior, unsecured, (non-credit enhanced) long-term debt ratings. Interest accrues on base rate loans as defined in the Revolving Credit Agreement. |
Extended expiration of credit facility |  | 1 year |
Letters of credit, outstanding |  | $ 3,300,000 |
1.625% Senior Notes due April 2019, effective interest rate of 1.77% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 250,000,000 | $ 0 | 250,000,000
Stated interest rate percentage | 1.625% | 1.625% |
Debt instrument maturity, month and year | 2019-04 | 2019-04 |
3.125% Senior Notes due April 2024, effective interest rate 3.32% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 300,000,000 | $ 300,000,000 |
Stated interest rate percentage | 3.125% | 3.125% |
Debt instrument maturity, month and year | 2024-04 | 2024-04 |
3.750% Senior Notes due April 2029, effective interest rate of 3.86% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 450,000,000 | $ 450,000,000 |
Stated interest rate percentage | 3.75% | 3.75% |
Debt instrument maturity, month and year | 2029-04 | 2029-04 |

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