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Retirement Benefits and Postemployment Benefits (Tables)
 12 Months Ended
May 29, 2016
RETIREMENT BENEFITS AND POSTEMPLOYMENT BENEFITS [Abstract]  
Health Care Cost Trend Rates [Table Text Block]
Fiscal Year
20162015
Health care cost trend rate for next year7.3% and 7.5%6.5% and 7.3%
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 rate20242025
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 2017$3.1$(2.7)
Effect on the other postretirement accumulated benefit obligation as of May 29, 201671.2(63.8)
Summarized Financial Information [Table Text Block]
Defined BenefitPension PlansOtherPostretirementBenefit PlansPostemploymentBenefit Plans
Fiscal YearFiscal YearFiscal Year
In Millions201620152016201520162015
Change in Plan Assets:
Fair value at beginning of year$5,758.5$5,611.8$582.8$517.3
Actual return on assets36.3373.6(0.1)44.0
Employer contributions23.724.124.124.1
Plan participant contributions5.710.314.113.6
Benefits payments(277.5)(244.9)(18.5)(16.2)
Foreign currency (6.8)(16.4)--
Fair value at end of year$5,539.9$5,758.5$602.4$582.8
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year$6,252.1$5,618.0$1,079.6$1,074.8$146.6$145.3
Service cost134.6137.019.022.47.67.5
Interest cost267.8249.244.146.93.94.3
Plan amendment0.91.9-(42.4)1.1-
Curtailment/other7.119.90.53.410.79.5
Plan participant contributions5.710.314.113.6--
Medicare Part D reimbursements--3.53.2--
Actuarial loss (gain)65.2479.7(64.5)23.511.2(0.4)
Benefits payments (278.0)(245.5)(66.4)(62.8)(16.9)(19.1)
Foreign currency (6.9)(18.4)(1.0)(3.0)(0.1)(0.5)
Projected benefit obligation at end of year$6,448.5$6,252.1$1,028.9$1,079.6$164.1$146.6
Plan assets less than benefit obligation as of fiscal year end$(908.6)$(493.6)$(426.5)$(496.8)$(164.1)$(146.6)
Amounts Recognized in AOCI [Table Text Block]
Defined BenefitPension PlansOther PostretirementBenefit PlansPostemploymentBenefit PlansTotal
Fiscal YearFiscal YearFiscal YearFiscal Year
In Millions20162015201620152016201520162015
Net actuarial loss$(1,886.0)$(1,674.9)$(57.6)$(72.2)$(14.6)$(9.0)$(1,958.2)$(1,756.1)
Prior service (costs) credits(6.8)(13.8)19.923.8(1.2)(2.9)11.97.1
Amounts recorded in accumulated other comprehensive loss$(1,892.8)$(1,688.7)$(37.7)$(48.4)$(15.8)$(11.9)$(1,946.3)$(1,749.0)
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 Millions201620152016201520162015
Projected benefit obligation$5,490.3$512.3$-$-$4.8$-
Accumulated benefit obligation4,998.3440.61,024.71,074.8159.3143.5
Plan assets at fair value4,498.5-602.4582.8--
Components of Net Periodic Benefit Expense [Table Text Block]
Defined Benefit Pension PlansOther Postretirement Benefit PlansPostemployment Benefit Plans
Fiscal YearFiscal YearFiscal Year
In Millions201620152014201620152014201620152014
Service cost$134.6$137.0$133.0$19.0$22.4$22.7$7.6$7.5$7.7
Interest cost267.8249.2239.544.146.950.53.94.34.1
Expected return on plan assets(496.9)(476.4)(455.6)(46.2)(40.2)(34.6)---
Amortization of losses189.8141.7151.06.64.915.40.70.70.6
Amortization of prior service costs (credits)4.77.45.6(5.4)(1.6)(3.4)2.52.42.4
Other adjustments5.015.1-2.33.3-10.79.53.7
Settlement or curtailment losses13.118.0-(1.0)1.3(2.9)---
Net expense $118.1$92.0$73.5$19.4$37.0$47.7$25.4$24.4$18.5
Amounts Expected to be Recognized Over Next Fiscal Year [Table Text Block]
In MillionsDefined BenefitPension PlansOther PostretirementBenefit PlansPostemploymentBenefit Plans
Amortization of losses$190.3$2.5$1.8
Amortization of prior service costs (credits)2.5(5.4)0.6
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
201620152016201520162015
Discount rate4.19%4.38%3.97%4.20%2.94%3.55%
Rate of salary increases4.284.09--4.354.36

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
201620152014201620152014201620152014
Discount rate4.38%4.54%4.54%4.20%4.51%4.52%3.55%3.82%3.70%
Rate of salary increases4.314.444.44---4.364.444.44
Expected long-term rate of return on plan assets8.538.538.538.148.138.11---
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 29, 2016 and May 31, 2015, by asset category were as follows:

May 29, 2016May 31, 2015
In MillionsLevel 1 Level 2 Level 3Total AssetsLevel 1 Level 2 Level 3Total Assets
Fair value measurement of pension plan assets:
Equity (a)$1,543.7$943.7$458.0$2,945.4$1,634.4$1,010.3$542.9$3,187.6
Fixed income (b)903.8745.8-1,649.6486.31,158.5-1,644.8
Real asset investments (c) 193.6160.8395.0749.4124.3116.7498.1739.1
Other investments (d)--0.40.4--0.40.4
Cash and accruals195.1--195.1186.6--186.6
Total fair value measurement of pension plan assets$2,836.2$1,850.3$853.4$5,539.9$2,431.6$2,285.5$1,041.4$5,758.5
Fair value measurement of postretirement benefit plan assets:
Equity (a)$128.9$124.1$23.4$276.4$134.0$120.6$23.7$278.3
Fixed income (b)18.083.4-101.414.073.7-87.7
Real asset investments (c) -30.613.844.40.225.716.642.5
Other investments (d)-171.3-171.3-168.9-168.9
Cash and accruals8.9--8.95.4--5.4
Fair value measurement of postretirement benefit plan assets$155.8$409.4$37.2$602.4$153.6$388.9$40.3$582.8

(a) Primarily publicly traded common stock and private equity partnerships 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, privately held securities, and private equity partnerships valued at unit values or net asset values provided by the investment managers, which are based on the fair value of the underlying investments. Various methods are used to determine fair values and may include the cost of the investment, most recent financing, and expected cash flows. For some of these investments, realization of the estimated fair value is dependent upon transactions between willing sellers and buyers.

(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, private securities, and limited partnerships valued at unit values or net asset values provided by the investment managers, which are generally 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.

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
2016201520162015
Asset category:
United States equities30.5%28.9%37.2%38.7%
International equities19.018.423.424.1
Private equities8.39.53.94.1
Fixed income28.630.329.426.3
Real assets13.612.96.16.8
Total100.0%100.0%100.0%100.0%
Rollforward of Level 3 Investments of Pension and Postretirement Benefit Plans' Assets [Table Text Block]
Fiscal 2016
In MillionsBalance as of May 31, 2015Net Transfers OutNet Purchases, Sales Issuances, and SettlementsNet Gain (Loss)Balance as of May 29, 2016
Pension benefit plan assets:
Equity$542.9$-$(92.6)$7.7$458.0
Real asset investments498.1-(72.8)(30.3)395.0
Other investments0.4---0.4
Fair value activity of level 3 pension plan assets$1,041.4$-$(165.4)$(22.6)$853.4
Postretirement benefit plan assets:
Equity$23.7$-$(1.2)$0.9$23.4
Real asset investments16.6-(1.8)(1.0)13.8
Fair value activity of level 3 postretirement benefit plan assets$40.3$-$(3.0)$(0.1)$37.2

Fiscal 2015
In MillionsBalance as of May 25, 2014Net TransfersOutNet Purchases, Sales Issuances, and SettlementsNet Gain (Loss)Balance as of May 31, 2015
Pension benefit plan assets:
Equity$568.2$-$(61.0)$35.7$542.9
Real asset investments602.9-(18.2)(86.6)498.1
Other investments0.3-0.2(0.1)0.4
Fair value activity of level 3 pension plan assets$1,171.4$-$(79.0)$(51.0)$1,041.4
Postretirement benefit plan assets:
Equity$21.1$-$0.3$2.3$23.7
Real asset investments17.9-0.5(1.8)16.6
Fair value activity of level 3 postretirement benefit plan assets$39.0$-$0.8$0.5$40.3
Estimated Benefit Payments [Table Text Block]
In MillionsDefined BenefitPension PlansOtherPostretirementBenefit PlansGross PaymentsMedicareSubsidyReceiptsPostemploymentBenefit Plans
2017$277.7$61.3$4.8$22.1
2018287.965.55.220.6
2019297.167.15.619.2
2020306.868.35.217.8
2021316.469.24.217.0
2022-20261,731.5355.223.275.6