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Accumulated Other Comprehensive (Loss) Income and Supplemental Equity Disclosure - Changes in AOCI (Details) - USD ($)	3 Months Ended
	Jul. 28, 2017	Jul. 29, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 50,416,000,000
Other comprehensive income (loss)	689,000,000	$ (156,000,000)
Balance	50,787,000,000
Unrealized Gain (Loss) on Available-for-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(69,000,000)	(107,000,000)
Other comprehensive income (loss) before reclassifications	39,000,000	116,000,000
Reclassifications	(9,000,000)	(1,000,000)
Other comprehensive income (loss)	30,000,000	115,000,000
Balance	(39,000,000)	8,000,000
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)	17,000,000	52,000,000
Reclassifications, tax expense (benefit)	4,000,000	0
Cumulative Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(1,452,000,000)	(474,000,000)
Other comprehensive income (loss) before reclassifications	831,000,000	(350,000,000)
Reclassifications	0	0
Other comprehensive income (loss)	831,000,000	(350,000,000)
Balance	(621,000,000)	(824,000,000)
Net Change in Retirement Obligations
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(1,129,000,000)	(1,197,000,000)
Other comprehensive income (loss) before reclassifications	(17,000,000)	0
Reclassifications	16,000,000	25,000,000
Other comprehensive income (loss)	(1,000,000)	25,000,000
Balance	(1,130,000,000)	(1,172,000,000)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)	(4,000,000)	0
Reclassifications, tax expense (benefit)	8,000,000	2,000,000
Unrealized Gain (Loss) on Derivative Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	37,000,000	(90,000,000)
Other comprehensive income (loss) before reclassifications	(159,000,000)	62,000,000
Reclassifications	(12,000,000)	(8,000,000)
Other comprehensive income (loss)	(171,000,000)	54,000,000
Balance	(134,000,000)	(36,000,000)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)	(91,000,000)	36,000,000
Reclassifications, tax expense (benefit)	8,000,000	6,000,000
Total Accumulated Other Comprehensive (Loss) Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(2,613,000,000)	(1,868,000,000)
Other comprehensive income (loss) before reclassifications	694,000,000	(172,000,000)
Reclassifications	(5,000,000)	16,000,000
Other comprehensive income (loss)	689,000,000	(156,000,000)
Balance	$ (1,924,000,000)	$ (2,024,000,000)

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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