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Debt (Narrative) (Details) ¥ in Billions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Mar. 31, 2017 JPY (¥) | May 31, 2016 | Feb. 29, 2016 | Jan. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Apr. 02, 2017 | Jun. 26, 2016 USD ($) | Mar. 27, 2016 USD ($) | Dec. 29, 2013
Debt redemption, amount |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit covenant compliance |  |  |  |  |  |  |  | As of September 30, 2018, we were in compliance with all applicable covenants. |  |  |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, covenant compliance |  |  |  |  |  |  |  | The indentures under which the above notes were issued also require us to maintain compliance with certain covenants, including limits on future liens and sale and leaseback transactions on certain material properties. As of October 1, 2018, we were in compliance with each of these covenants. |  |  |  |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Borrowing Capacity, Amount |  |  |  |  |  |  |  | $ 3,000,000,000 |  |  |  |  |  |  |
Combined borrowing limit of Commercial Paper Program and Credit Facility |  |  |  |  |  |  |  | $ 3,000,000,000 |  |  |  |  |  |  |
Commercial Paper [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  | 397 days |  |  |  |  |  |  |
Three Point Eight Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 1,250,000,000 |  |  | $ 0 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 3.80% |  |  |  |  |  |  |
Three Point Eight Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes | Aug. 08, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Aug. 08, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PointThreeSevenTwoPercentageYenDenominatedSeniorNotes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  | ¥ 85 |  |  |  | $ 748,400,000 |  |  | 755,300,000 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 0.372% |  |  |  | 0.372% |  |  |
PointThreeSevenTwoPercentageYenDenominatedSeniorNotes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes |  |  |  | Mar. 01, 2017 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Mar. 01, 2024 |  |  |  |  |  |  |  |  |  |  |
Point Eight Seven Five Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.875%
Two Point Four Five Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 500,000,000 |  |  | 500,000,000 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 2.45% |  |  |  |  |  |  |
Two Point Four Five Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes |  |  |  |  | May 11, 2016 |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Debt Instrument, Maturity Date |  |  |  |  | Jun. 15, 2026 |  |  |  |  |  |  |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.45% |  |
Two Point One Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 500,000,000 |  |  | 500,000,000 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 2.10% |  |  |  |  |  |  |
Face amount from reopening of previous Senior Notes |  |  |  |  |  |  |  | $ 250,000,000 |  |  | 250,000,000 |  | $ 250,000,000 |  |
Two Point One Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes |  |  |  |  | May 11, 2016 | Feb. 04, 2016 |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Debt Instrument, Maturity Date |  |  |  |  |  | Feb. 04, 2021 |  |  |  |  |  |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.10% |
Face amount for 2021 Notes, collectively |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |
Two Point Seven Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 500,000,000 |  |  | 500,000,000 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 2.70% |  |  |  |  |  |  |
Four Point Three Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 350,000,000 |  |  | 350,000,000 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 4.30% |  |  |  |  |  |  |
Four Point Zero Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 750,000,000 |  |  | 0 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |
Four Point Zero Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes | Aug. 08, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Nov. 01, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Four Point Five Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  | 0 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |
Four Point Five Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes | Aug. 08, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Nov. 01, 2048 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Point One Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |  | 0 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 3.10% | 3.10% |  |  |  |  |  |
Three Point One Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes |  | Feb. 26, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  | Mar. 01, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Three Point Five Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 600,000,000 | $ 600,000,000 |  | 0 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 3.50% | 3.50% |  |  |  |  |  |
Three Point Five Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes |  | Feb. 26, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  | Mar. 01, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |
Two Point Two Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 500,000,000 |  | $ 500,000,000 | 0 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 2.20% |  | 2.20% |  |  |  |  |
Two Point Two Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes |  |  | Nov. 22, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Nov. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Three Point Seven Five Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |
Face value of Senior Notes |  |  |  |  |  |  |  | $ 500,000,000 |  | $ 500,000,000 | 0 |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  | 3.75% |  | 3.75% |  |  |  |  |
Three Point Seven Five Percentage Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance date of Senior Notes |  |  | Nov. 22, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Dec. 01, 2047 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  | $ 750,000,000 |  |  | $ 750,000,000 |  |  |  |
twothousandeighteencreditfacility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |
Amount of credit facility available for issuances of letters of credit |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |
Maturity date of credit facility |  |  |  |  |  |  |  | Oct. 25, 2022 |  |  |  |  |  |  |
Maximum increase in commitment amount allowable under the credit facility |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
twothousandeighteencreditfacility [Member] | Revolving Credit Facility [Member] | Eurocurrency Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental interest rate over variable rate loans |  |  |  |  |  |  |  | 0.68% |  |  |  |  |  |  |
twothousandeighteencreditfacility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental interest rate over variable rate loans |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
threehundredsixtyfourdaycreditfacility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility available for issuances of letters of credit |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Maturity date of credit facility |  |  |  |  |  |  |  | Oct. 25, 2018 |  |  |  |  |  |  |
Maximum increase in commitment amount allowable under the credit facility |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
threehundredsixtyfourdaycreditfacility [Member] | Revolving Credit Facility [Member] | Eurocurrency Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental interest rate over variable rate loans |  |  |  |  |  |  |  | 0.585% |  |  |  |  |  |  |
threehundredsixtyfourdaycreditfacility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental interest rate over variable rate loans |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Designated as Hedging Instrument [Member] | ForeignExchangeYenDebt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  | $ 85,000,000,000 |  |  |  |  |  |  |

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