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Debt (Narrative) (Details) ¥ in Billions	1 Months Ended						3 Months Ended	12 Months Ended
Debt (Narrative) (Details) ¥ in Billions	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