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Financing Arrangements - Additional Information (Detail) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 27, 2019 USD ($) | Jul. 28, 2017 USD ($) Extension | Jan. 24, 2020 USD ($) | Apr. 26, 2019 USD ($)
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, amount |  | $ 1,000,000,000.0 |  |
Credit facility, date expiry |  | Dec. 10, 2021 |  |
Credit facility, increase in facility |  | $ 300,000,000 |  |
Credit facility, number of extensions | Extension |  | 2 |  |
Credit facility, extensions period |  | 1 year |  |
Credit facility, amounts drawn |  |  | $ 0 |
Revolving Credit Facility | Letter Of Credit Sub Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, amount |  | $ 50,000,000 |  |
Commercial Paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes issued, principal amount |  |  | $ 694,000,000 | $ 249,000,000
Weighted-average interest rate |  |  | 1.97% | 2.73%
Commercial Paper | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes issued, principal amount |  | $ 1,000,000,000.0 |  |
Debt instrument maturity period |  | 397 days | 3 months | 3 months
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes issued, principal amount |  |  | $ 1,150,000,000 | $ 1,550,000,000
Senior Notes | Due June 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes issued, principal amount |  |  | $ 500,000,000 | 500,000,000
Notes issued, interest rate |  |  | 3.375% |
Senior Notes | Due September 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes issued, principal amount |  |  | $ 400,000,000 | 400,000,000
Notes issued, interest rate |  |  | 3.30% |
Senior Notes | Due December 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes issued, principal amount |  |  | $ 250,000,000 | 250,000,000
Notes issued, interest rate |  |  | 3.25% |
Senior Notes | Due September 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes issued, principal amount |  |  | $ 0 | $ 400,000,000
Notes issued, interest rate | 2.00% |  |  |
Extinguishment of debt amount | $ 400,000,000 |  |  |

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