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Accumulated Other Comprehensive (Loss) Income and Supplemental Equity Disclosure - Changes in AOCI (Details) - USD ($) | 3 Months Ended
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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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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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