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Retirement Benefits and Postemployment Benefits (Tables)
 12 Months Ended
May 28, 2017
RETIREMENT BENEFITS AND POSTEMPLOYMENT BENEFITS [Abstract]  
Health Care Cost Trend Rates [Table Text Block]
Fiscal Year
20172016
Health care cost trend rate for next year7.0% and 7.3%7.3% and 7.5%
Rate to which the cost trend rate is assumed to decline (ultimate rate)5.0%5.0%
Year that the rate reaches the ultimate trend rate20242024
Effect of One Percentage Point Change in Health Care Cost Trend Rate [Table Text Block]
In MillionsOne Percentage Point IncreaseOne Percentage PointDecrease
Effect on the aggregate of the service and interest cost components in fiscal 2018$2.2$(1.9)
Effect on the other postretirement accumulated benefit obligation as of May 28, 201759.5(53.8)
Summarized Financial Information [Table Text Block]
Defined BenefitPension PlansOtherPostretirementBenefit PlansPostemploymentBenefit Plans
Fiscal YearFiscal YearFiscal Year
In Millions201720162017201620172016
Change in Plan Assets:
Fair value at beginning of year$5,539.9$5,758.5$602.4$582.8
Actual return on assets645.636.375.2(0.1)
Employer contributions25.423.720.124.1
Plan participant contributions8.85.715.214.1
Benefits payments(282.2)(277.5)(18.1)(18.5)
Foreign currency (12.3)(6.8)--
Fair value at end of year$5,925.2$5,539.9$694.8$602.4
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year$6,448.5$6,252.1$1,028.9$1,079.6$164.1$146.6
Service cost119.7134.612.519.08.87.6
Interest cost216.5267.832.244.12.63.9
Plan amendment(130.9)0.9---1.1
Curtailment/other1.97.1(0.3)0.51.310.7
Plan participant contributions8.85.715.214.1--
Medicare Part D reimbursements--3.43.5--
Actuarial loss (gain)88.565.2(77.6)(64.5)(7.4)11.2
Benefits payments (282.6)(278.0)(63.3)(66.4)(34.7)(16.9)
Foreign currency (11.8)(6.9)0.4(1.0)(0.2)(0.1)
Projected benefit obligation at end of year$6,458.6$6,448.5$951.4$1,028.9$134.5$164.1
Plan assets less than benefit obligation as of fiscal year end$(533.4)$(908.6)$(256.6)$(426.5)$(134.5)$(164.1)
Amounts Recognized in AOCI [Table Text Block]
Defined BenefitPension PlansOther PostretirementBenefit PlansPostemploymentBenefit PlansTotal
Fiscal YearFiscal YearFiscal YearFiscal Year
In Millions20172016201720162017201620172016
Net actuarial loss$(1,621.4)$(1,886.0)$(14.5)$(57.6)$(9.5)$(14.6)$(1,645.4)$(1,958.2)
Prior service (costs) credits(3.9)(6.8)22.819.90.6(1.2)19.511.9
Amounts recorded in accumulated other comprehensive loss$(1,625.3)$(1,892.8)$8.3$(37.7)$(8.9)$(15.8)$(1,625.9)$(1,946.3)
Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
Defined BenefitPension PlansOther PostretirementBenefit PlansPostemploymentBenefit Plans
Fiscal YearFiscal YearFiscal Year
In Millions201720162017201620172016
Projected benefit obligation$610.1$5,490.3$5.5$-$4.4$4.8
Accumulated benefit obligation542.34,998.3947.91,024.7130.1159.3
Plan assets at fair value51.94,498.5694.8602.4--
Components of Net Periodic Benefit Expense [Table Text Block]
Defined Benefit Pension PlansOther Postretirement Benefit PlansPostemployment Benefit Plans
Fiscal YearFiscal YearFiscal Year
In Millions201720162015201720162015201720162015
Service cost$119.7$134.6$137.0$12.5$19.0$22.4$8.8$7.6$7.5
Interest cost216.5267.8249.232.244.146.92.63.94.3
Expected return on plan assets(486.7)(496.9)(476.4)(48.5)(46.2)(40.2)---
Amortization of losses190.2189.8141.72.56.64.91.70.70.7
Amortization of prior service costs (credits)2.54.77.4(5.4)(5.4)(1.6)0.62.52.4
Other adjustments3.15.015.11.32.33.31.310.79.5
Settlement or curtailment losses3.813.118.0(0.9)(1.0)1.3(1.4)--
Net expense $49.1$118.1$92.0$(6.3)$19.4$37.0$13.6$25.4$24.4
Amounts Expected to be Recognized Over Next Fiscal Year [Table Text Block]
In MillionsDefined BenefitPension PlansOther PostretirementBenefit PlansPostemploymentBenefit Plans
Amortization of losses$176.9$0.8$0.6
Amortization of prior service costs (credits)1.9(5.4)0.8
Weighted-Average Assumptions [Table Text Block]

Weighted-average assumptions used to determine fiscal year-end benefit obligations are as follows:

Defined BenefitPension PlansOther PostretirementBenefit PlansPostemploymentBenefit Plans
Fiscal YearFiscal YearFiscal Year
201720162017201620172016
Discount rate4.08%4.19%3.92%3.97%2.87%2.94%
Rate of salary increases4.254.28--4.464.35

Weighted-average assumptions used to determine fiscal year net periodic benefit expense are as follows:

Defined BenefitPension PlansOther PostretirementBenefit PlansPostemploymentBenefit Plans
Fiscal YearFiscal YearFiscal Year
2017 (a)201620152017 (a)201620152017 (a)20162015
Discount rate4.19%4.38%4.54%3.97%4.20%4.51%2.94%3.55%3.82%
Service cost effective rate4.57--4.42--3.55--
Interest cost effective rate3.44--3.17--2.67--
Rate of salary increases4.284.314.44---4.354.364.44
Expected long-term rate of return on plan assets8.178.538.537.858.148.13---
(a) Beginning in fiscal 2017, we adopted the full yield curve method.
Schedule of Allocation of Plan Assets, Including Fair Value Hierarchy Levels and Weighted-Average Target Asset Allocations [Table Text Block]

The fair values of our pension and postretirement benefit plans’ assets and their respective levels in the fair value hierarchy at May 28, 2017, and May 29, 2016, by asset category were as follows:

May 28, 2017May 29, 2016
In MillionsLevel 1 Level 2 Level 3Total AssetsLevel 1 Level 2 Level 3Total Assets
Fair value measurement of pension plan assets:
Equity (a)$1,773.0$781.2$-$2,554.2$1,543.7$741.9$-$2,285.6
Fixed income (b)951.9742.2-1,694.1903.8745.8-1,649.6
Real asset investments (c) 253.195.8-348.9193.695.2-288.8
Other investments (d)--0.30.3--0.40.4
Cash and accruals174.2--174.2195.1--195.1
Fair value measurement of pension plan assets in the fair value hierarchy$3,152.2$1,619.2$0.3$4,771.7$2,836.2$1,582.9$0.4$4,419.5
Investments measured at net asset value (e)1,153.51,120.4
Total pension plan investments$5,925.2$5,539.9
Fair value measurement of postretirement benefit plan assets:
Equity (a)$122.3$67.5$-$189.8$128.9$87.6$-$216.5
Fixed income (b)34.1160.0-194.118.083.4-101.4
Real asset investments (c) 18.014.5-32.5-14.3-14.3
Other investments (d)--------
Cash and accruals11.3--11.38.9--8.9
Fair value measurement of postretirement benefit plan assets in the fair value hierarchy$185.7$242.0$-$427.7$155.8$185.3$-$341.1
Investments measured at net asset value (e)267.1261.3
Total postretirement benefit plan investments$694.8$602.4

(a) Primarily publicly traded common stock for purposes of total return and to maintain equity exposure consistent with policy allocations. Investments include: United States and international equity securities, mutual funds, and equity futures valued at closing prices from national exchanges, and commingled funds valued at unit values provided by the investment managers, which are based on the fair value of the underlying investments.

(b) Primarily government and corporate debt securities and futures for purposes of total return, managing fixed income exposure to policy allocations, and managing duration targets. Investments include: fixed income securities and bond futures generally valued at closing prices from national exchanges, fixed income pricing models, and independent financial analysts; and fixed income commingled funds valued at unit values provided by the investment managers, which are based on the fair value of the underlying investments.

(c) Publicly traded common stock and limited partnerships in the energy and real estate sectors for purposes of total return. Investments include: energy and real estate securities generally valued at closing prices from national exchanges, and commingled funds valued at unit values provided by the investment managers, which are based on the fair value of the underlying investments.

(d) Global balanced fund of equity, fixed income, and real estate securities for purposes of meeting Canadian pension plan asset allocation policies, and insurance and annuity contracts to provide a stable stream of income for retirees and to fund postretirement medical benefits. Fair values are derived from unit values provided by the investment managers, which are generally based on the fair value of the underlying investments and contract fair values from the providers.

(e) Primarily private investments and common collective trusts that are measured at fair value using the net asset value per share (or its equivalent) practical expedient and have not been classified in the fair value hierarchy.

Weighted-average asset allocations for the past two fiscal years for our defined benefit pension and other postretirement benefit plans are as follows:

Defined BenefitPension PlansOther PostretirementBenefit Plans
Fiscal YearFiscal Year
2017201620172016
Asset category:
United States equities28.5%30.5%31.9%37.2%
International equities17.919.017.823.4
Private equities7.88.33.63.9
Fixed income31.728.640.029.4
Real assets14.113.66.76.1
Total100.0%100.0%100.0%100.0%
Estimated Benefit Payments [Table Text Block]
In MillionsDefined BenefitPension PlansOtherPostretirementBenefit PlansGross PaymentsMedicareSubsidyReceiptsPostemploymentBenefit Plans
2018$290.2$59.5$4.3$21.2
2019298.661.64.619.0
2020307.763.04.217.4
2021316.464.13.516.1
2022325.764.83.615.0
2023-20271,767.8328.818.861.5