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Retirement Benefit Plans , Fair Value Measurement (Details) - Pension benefits - USD ($) $ in Millions	12 Months Ended
	Apr. 28, 2017	Apr. 29, 2016	Apr. 24, 2015
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	$ 1,235	$ 1,113
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	2,479	2,138	$ 2,204
Investments Measured at Net Asset Value	1,426	1,187
U.S. Pension Benefits | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	306	264
U.S. Pension Benefits | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	279	225
U.S. Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	468	462
U.S. Pension Benefits | Short-term investments
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	168	127
U.S. Pension Benefits | Short-term investments | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	168	127
U.S. Pension Benefits | Short-term investments | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Short-term investments | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | U.S. government securities
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	167	146
U.S. Pension Benefits | U.S. government securities | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	138	137
U.S. Pension Benefits | U.S. government securities | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	29	9
U.S. Pension Benefits | U.S. government securities | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Corporate debt securities
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	250	216
U.S. Pension Benefits | Corporate debt securities | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Corporate debt securities | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	250	216
U.S. Pension Benefits | Corporate debt securities | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	0	1
Total realized gains included in income		0
Total unrealized gains included in accumulated other comprehensive (loss) income		(1)
Purchases and sales, net		0
Ending balance		0
U.S. Pension Benefits | Equity commingled trusts
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	1,127	956
Investments Measured at Net Asset Value	1,127	956
U.S. Pension Benefits | Equity commingled trusts | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Equity commingled trusts | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Equity commingled trusts | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Fixed income commingled trusts
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	299	231
Investments Measured at Net Asset Value	299	231
U.S. Pension Benefits | Fixed income commingled trusts | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Fixed income commingled trusts | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Fixed income commingled trusts | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Investments | Level 3
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	462	473
Total realized gains included in income	25	10
Total unrealized gains included in accumulated other comprehensive (loss) income	28	(144)
Purchases and sales, net	(47)	123
Ending balance	468	462
U.S. Pension Benefits | Partnership units
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	468	462
U.S. Pension Benefits | Partnership units | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Partnership units | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
U.S. Pension Benefits | Partnership units | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	468	462
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	462	472
Total realized gains included in income	25	10
Total unrealized gains included in accumulated other comprehensive (loss) income	28	(143)
Purchases and sales, net	(47)	123
Ending balance	468	462
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	1,235	1,113	$ 1,189
Investments Measured at Net Asset Value	1,191	1,037
Non-U.S. Pension Benefits | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
Non-U.S. Pension Benefits | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
Non-U.S. Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	44	76
Non-U.S. Pension Benefits | Investments | Level 3
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	76	76
Total unrealized gains included in accumulated other comprehensive (loss) income	2
Purchases and sales, net	(31)	(2)
Currency exchange rate changes	(3)	2
Ending balance	44	76
Non-U.S. Pension Benefits | Partnership units | Level 3
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	0	16
Purchases and sales, net		(16)
Currency exchange rate changes		0
Ending balance		0
Non-U.S. Pension Benefits | Registered investment companies
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	1,191	1,037
Investments Measured at Net Asset Value	1,191	1,037
Non-U.S. Pension Benefits | Registered investment companies | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
Non-U.S. Pension Benefits | Registered investment companies | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
Non-U.S. Pension Benefits | Registered investment companies | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
Non-U.S. Pension Benefits | Insurance contracts
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	44	76
Non-U.S. Pension Benefits | Insurance contracts | Level 1
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
Non-U.S. Pension Benefits | Insurance contracts | Level 2
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	0	0
Non-U.S. Pension Benefits | Insurance contracts | Level 3
Defined Benefit Plan Disclosure [Line items]
Fair value of plan assets	44	76
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	76	60
Total unrealized gains included in accumulated other comprehensive (loss) income	2
Purchases and sales, net	(31)	14
Currency exchange rate changes	(3)	2
Ending balance	$ 44	$ 76

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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