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RETIREMENT PLANS - Schedule of Weighted-Average Asset Allocations for U.S Pension Plans and International Pension Plan (Details) - Pension Plan - USD ($)
$ in Millions
May 31, 2025
May 31, 2024
May 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 27,245 $ 26,399  
U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 26,601 $ 25,797 $ 24,826
Actual % 100.00% 100.00%  
U.S. Pension Plans | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 4,352 $ 4,097  
U.S. Pension Plans | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 9,768 9,513  
U.S. Pension Plans | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 1,083 1,075 937
U.S. Pension Plans | U.S. Large Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 3,804 $ 3,376  
Actual % 14.00% 13.00%  
U.S. Pension Plans | U.S. Large Cap Equity | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 1,678 $ 1,382  
U.S. Pension Plans | U.S. Large Cap Equity | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | U.S. Large Cap Equity | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | International equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 2,869 $ 2,631  
Actual % 11.00% 10.00%  
U.S. Pension Plans | International equities | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 1,994 $ 1,780  
U.S. Pension Plans | International equities | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | International equities | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | Global equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 1,224 $ 1,397  
Actual % 5.00% 5.00%  
U.S. Pension Plans | Global equities | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 0 $ 0  
U.S. Pension Plans | Global equities | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | Global equities | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | U.S. SMID cap equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 671 $ 926  
Actual % 2.00% 4.00%  
U.S. Pension Plans | U.S. SMID cap equity | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 662 $ 916  
U.S. Pension Plans | U.S. SMID cap equity | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 9 10  
U.S. Pension Plans | U.S. SMID cap equity | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 6,625 $ 6,502  
Actual % 25.00% 25.00%  
U.S. Pension Plans | Corporate | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 0 $ 0  
U.S. Pension Plans | Corporate | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 6,625 6,502  
U.S. Pension Plans | Corporate | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | Government      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 4,142 $ 4,194  
Actual % 16.00% 16.00%  
U.S. Pension Plans | Government | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 0 $ 0  
U.S. Pension Plans | Government | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 2,277 2,335  
U.S. Pension Plans | Government | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | Mortgage-backed and other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 1,648 $ 1,514  
Actual % 6.00% 6.00%  
U.S. Pension Plans | Mortgage-backed and other | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 0 $ 0  
U.S. Pension Plans | Mortgage-backed and other | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 229 205  
U.S. Pension Plans | Mortgage-backed and other | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | Alternative investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 4,972 $ 4,777  
Actual % 19.00% 19.00%  
U.S. Pension Plans | Alternative investments | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Range % 15.00% 15.00%  
U.S. Pension Plans | Alternative investments | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Range % 25.00% 25.00%  
U.S. Pension Plans | Alternative investments | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 0 $ 0  
U.S. Pension Plans | Alternative investments | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
U.S. Pension Plans | Alternative investments | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 1,083 1,075  
U.S. Pension Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 5 $ (97)  
Actual % 0.00% 0.00%  
U.S. Pension Plans | Other | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ (16) $ (111)  
U.S. Pension Plans | Other | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 21 14  
U.S. Pension Plans | Other | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 0 $ 0  
U.S. Pension Plans | Total Equities | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Range % 25.00% 25.00%  
U.S. Pension Plans | Total Equities | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Range % 40.00% 40.00%  
U.S. Pension Plans | Total Fixed Income Securities | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Range % 40.00% 40.00%  
U.S. Pension Plans | Total Fixed Income Securities | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Range % 60.00% 60.00%  
U.S. Pension Plans | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 641 $ 577  
Actual % 2.00% 2.00%  
U.S. Pension Plans | Cash and cash equivalents | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Range % 0.00% 0.00%  
U.S. Pension Plans | Cash and cash equivalents | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Range % 5.00% 5.00%  
U.S. Pension Plans | Cash and cash equivalents | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets $ 34 $ 130  
U.S. Pension Plans | Cash and cash equivalents | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 607 447  
U.S. Pension Plans | Cash and cash equivalents | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 0 0  
International Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of
Plan Assets 644 602 $ 579
Portion of fair value of plan assets $ 349 $ 341  
Actual % 100.00% 100.00%  
International Pension Plans | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 153 $ 157  
International Pension Plans | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 118 $ 62  
Actual % 34.00% 18.00%  
International Pension Plans | Corporate | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 0 $ 0  
International Pension Plans | Corporate | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Corporate | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Government      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 184 $ 177  
Actual % 53.00% 52.00%  
International Pension Plans | Government | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 141 $ 149  
International Pension Plans | Government | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Government | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 35 $ 94  
Actual % 10.00% 28.00%  
International Pension Plans | Other | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 0 $ 0  
International Pension Plans | Other | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Other | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 12 $ 8  
Actual % 3.00% 2.00%  
International Pension Plans | Cash and cash equivalents | Quoted Prices in
Active Markets
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 12 $ 8  
International Pension Plans | Cash and cash equivalents | Other Observable
Inputs
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets 0 0  
International Pension Plans | Cash and cash equivalents | Unobservable
Inputs
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Portion of fair value of plan assets $ 0 $ 0