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Condensed Consolidated Statements of Changes in Common Stockholders' Investment - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Beginning Balance     $ 18,295  
Net income $ 1,226 $ 560 2,471 $ 1,305
Other comprehensive income, net of tax (expense)/benefit 122 52 249 (52)
Ending Balance 21,039 18,659 21,039 18,659
Common Stock        
Beginning Balance 32 32 32 32
Ending Balance 32 32 32 32
Additional Paid-In Capital        
Beginning Balance 3,375 3,257 3,356 3,231
Employee incentive plans and other 25 30 44 56
Ending Balance 3,400 3,287 3,400 3,287
Retained Earnings        
Beginning Balance 26,108 25,048 25,216 24,648
Net income 1,226 560 2,471 1,305
Cash dividends declared (172) (170) (513) (509)
Employee incentive plans and other 46 (7) 34 (9)
Ending Balance 27,208 25,431 27,208 25,431
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-02 and 2018-02        
Beginning Balance [1]       (4)
Accumulated Other Comprehensive Income        
Beginning Balance (1,020) (918) (1,147) (865)
Other comprehensive income, net of tax (expense)/benefit 122 52 249 (52)
Ending Balance (898) (866) (898) (866)
Accumulated Other Comprehensive Income | Accounting Standards Update 2018-02        
Reclassification to retained earnings due to the adoption of a new accounting standard on June 1, 2019 [2]       51
Treasury Stock        
Beginning Balance (9,033) (9,253) (9,162) (9,289)
Purchase of treasury stock       (3)
Employee incentive plans and other 330 28 459 67
Ending Balance $ (8,703) $ (9,225) $ (8,703) $ (9,225)
[1] Relates to the adoption of Accounting Standards Update (“ASU”) 2016-02 and ASU 2018-02.
[2] Relates to the adoption of ASU 2018-02.