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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Oct. 30, 2015
Oct. 24, 2014
Oct. 30, 2015
Oct. 24, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ (1,184) $ (597)
Other comprehensive (loss) income before reclassifications, before tax     (322) 211
Tax benefit (expense)     91 (115)
Other comprehensive (loss) income before reclassifications, net of tax     (231) 96
Reclassifications, before tax     (93) (6)
Tax benefit (expense)     37 1
Reclassifications, net of tax     (56) (5)
Other comprehensive (loss) income $ (115) $ (18) (287) 91
Ending balance (1,471) (506) (1,471) (506)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     14 (6)
Other comprehensive (loss) income before reclassifications, before tax     (302) 61
Tax benefit (expense)     108 (22)
Other comprehensive (loss) income before reclassifications, net of tax     (194) 39
Reclassifications, before tax     (20) (28)
Tax benefit (expense)     7 9
Reclassifications, net of tax     (13) (19)
Other comprehensive (loss) income     (207) 20
Ending balance (193) 14 (193) 14
Cumulative Translation Adjustments [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (277) 218
Other comprehensive (loss) income before reclassifications, before tax     (59) (129)
Tax benefit (expense)     0 0
Other comprehensive (loss) income before reclassifications, net of tax     (59) (129)
Reclassifications, before tax     0 0
Tax benefit (expense)     0 0
Reclassifications, net of tax     0 0
Other comprehensive (loss) income     (59) (129)
Ending balance (336) 89 (336) 89
Net Change in Retirement Obligations [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (1,131) (765)
Other comprehensive (loss) income before reclassifications, before tax     (5) 16
Tax benefit (expense)     0 0
Other comprehensive (loss) income before reclassifications, net of tax     (5) 16
Reclassifications, before tax     60 38
Tax benefit (expense)     (20) (12)
Reclassifications, net of tax     40 26
Other comprehensive (loss) income     35 42
Ending balance (1,096) (723) (1,096) (723)
Unrealized Gain (Loss) on Derivatives [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     210 (44)
Other comprehensive (loss) income before reclassifications, before tax     44 263
Tax benefit (expense)     (17) (93)
Other comprehensive (loss) income before reclassifications, net of tax     27 170
Reclassifications, before tax     (133) (16)
Tax benefit (expense)     50 4
Reclassifications, net of tax     (83) (12)
Other comprehensive (loss) income     (56) 158
Ending balance $ 154 $ 114 $ 154 $ 114