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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 5 Months Ended 7 Months Ended 12 Months Ended
Feb. 28, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
May 31, 2018
Dec. 31, 2017
May 31, 2018
May 31, 2017
May 31, 2016
Income Taxes [Line Items]                  
Earnings From Foreign Operations             $ 958 $ 919 $ 905
Statutory Federal Income Tax Rate         21.00% 35.00% 29.20% 35.00% 35.00%
Provisional benefit related to remeasurement of net U.S. deferred tax liability $ (1,150)   $ (1,150)       $ (1,150)    
Income tax benefit related to lower statutory Income tax rate on earnings   $ 100 165       265    
Tax benefit from corporate structuring transactions   (255)         255 [1] $ 68 [1] $ 76 [1]
Tax benefits from foreign tax credits   133 12 $ 80     $ 225    
Measurement period             1 year    
Unrecognized Tax Benefits That Would Impact Effective Tax Rate   142     $ 142   $ 142 63  
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest   $ 35     $ 35   35 11  
Foreign Country [Member]                  
Income Taxes [Line Items]                  
Operating Loss Carryforwards               3,600  
State And Local Jurisdiction [Member]                  
Income Taxes [Line Items]                  
Operating Loss Carryforwards               770  
Adoption of U.S. Foreign Currency Tax Regulations [Member]                  
Income Taxes [Line Items]                  
Impact on tax rate, amount               62  
U.S. Plans [Member]                  
Income Taxes [Line Items]                  
Additional provisional amount recognized one time benefit 204   204            
Benefit of contribution $ 1,500   $ 1,500       $ 2,500 $ 2,000  
[1] The 2018 and 2017 net benefits consist of foreign deferred tax benefits of $434 million and $94 million, respectively, which were partially offset by U.S. deferred tax expenses of $179 million and $26 million, respectively.