Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) - USD ($)	3 Months Ended				9 Months Ended
	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Jan. 02, 2015	Jan. 01, 2016	Jan. 02, 2015	Apr. 03, 2015
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	$ 3,450,000,000				$ 3,450,000,000		$ 3,381,000,000
Accumulated Amortization	2,212,000,000				2,212,000,000		2,221,000,000
Net Carrying Value	1,238,000,000				1,238,000,000		1,160,000,000
Amortization expense	75,000,000			$ 94,000,000	214,000,000	$ 299,000,000
Outsourcing contract costs amortization expense	3,000,000			8,000,000	8,000,000	25,000,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Remainder of 2016	85,000,000				85,000,000
2017	280,000,000				280,000,000
2018	241,000,000				241,000,000
2019	214,000,000				214,000,000
2020	184,000,000				184,000,000
GIS
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Gain on sale of intangible asset			$ 31,000,000			43,000,000
Outsourcing contract costs
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	811,000,000				811,000,000		802,000,000
Accumulated Amortization	476,000,000				476,000,000		476,000,000
Net Carrying Value	335,000,000				335,000,000		326,000,000
Software
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	2,220,000,000				2,220,000,000		2,286,000,000
Accumulated Amortization	1,491,000,000				1,491,000,000		1,568,000,000
Net Carrying Value	729,000,000				729,000,000		718,000,000
Software | Internal-use software
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense	43,000,000			$ 49,000,000	125,000,000	150,000,000
Customer and other intangible assets
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	419,000,000				419,000,000		293,000,000
Accumulated Amortization	245,000,000				245,000,000		177,000,000
Net Carrying Value	174,000,000				174,000,000		$ 116,000,000
Network-related Intangible Assets | GIS
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Cash proceeds from sale of intangible assets	0	$ 0	$ 31,000,000			17,000,000
Consideration on sale of intangible asset						$ 43,000,000
Receivable from sale of intangible assets	$ 4,000,000				$ 4,000,000