Financial Instruments, Risk Management Activities, and Fair Values (Schedule of interest rate hedge in AOCI) (Details) $ in Millions	12 Months Ended
	May 26, 2019 USD ($)
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (45.2)
3.15% notes due December 15, 2021 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (25.3)
Derivative, Maturity Date	Dec. 15, 2021
Debt Instrument, Interest Rate, Stated Percentage	3.15%
2.6% notes due October 12, 2022 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ 2.5
Derivative, Maturity Date	Oct. 12, 2022
Debt Instrument, Interest Rate, Stated Percentage	2.60%
1.0% notes due April 27, 2023 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (0.9)
Derivative, Maturity Date	Apr. 27, 2023
Debt Instrument, Interest Rate, Stated Percentage	1.00%
3.7% notes due October 17, 2023 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (1.5)
Derivative, Maturity Date	Oct. 17, 2023
Debt Instrument, Interest Rate, Stated Percentage	3.70%
3.65% notes due February 15, 2024 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ 8.4
Derivative, Maturity Date	Feb. 15, 2024
Debt Instrument, Interest Rate, Stated Percentage	3.65%
4.0% notes due April 17, 2025 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (3.4)
Derivative, Maturity Date	Apr. 17, 2025
Debt Instrument, Interest Rate, Stated Percentage	4.00%
3.2% notes due February 10, 2027 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ 13.2
Derivative, Maturity Date	Feb. 10, 2027
Debt Instrument, Interest Rate, Stated Percentage	3.20%
1.5% notes due April 27, 2027 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (2.6)
Derivative, Maturity Date	Apr. 27, 2027
Debt Instrument, Interest Rate, Stated Percentage	1.50%
4.2% notes due April 17, 2028 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (9.1)
Derivative, Maturity Date	Apr. 17, 2028
Debt Instrument, Interest Rate, Stated Percentage	4.20%
4.55% notes due April 17, 2038 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (10.3)
Derivative, Maturity Date	Apr. 17, 2038
Debt Instrument, Interest Rate, Stated Percentage	4.55%
5.4% notes due June 15, 2040 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (11.8)
Derivative, Maturity Date	Jun. 15, 2040
Debt Instrument, Interest Rate, Stated Percentage	5.40%
4.15% notes due February 15, 2043 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ 9.3
Derivative, Maturity Date	Feb. 15, 2043
Debt Instrument, Interest Rate, Stated Percentage	4.15%
4.7% notes due April 17, 2048 [Member]
Debt Instrument [Line Items]
Pre-tax hedge gain (loss) in AOCI	$ (13.7)
Derivative, Maturity Date	Apr. 17, 2048
Debt Instrument, Interest Rate, Stated Percentage	4.70%