Consolidated Statements of Changes in Common Stockholders' Investment - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
May 31, 2020 |
Aug. 31, 2019 |
May 31, 2019 |
Aug. 31, 2018 |
May 31, 2020 |
May 31, 2019 |
May 31, 2018 |
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| Beginning Balance | $ 17,757 | $ 19,416 | $ 17,757 | $ 19,416 | $ 16,073 | ||||||||||||||||||
| Net income | $ (334) | [1],[2] | 745 | [1],[2] | $ (1,969) | [3],[4] | 835 | [3],[4] | 1,286 | 540 | 4,572 | ||||||||||||
| Other comprehensive loss, net of tax | (333) | (287) | (163) | ||||||||||||||||||||
| Purchase of treasury stock | (3) | (1,480) | (1,017) | ||||||||||||||||||||
| Cash dividends declared | (679) | (683) | (535) | ||||||||||||||||||||
| Employee incentive plans and other | 220 | 251 | 486 | ||||||||||||||||||||
| Ending Balance | 18,295 | 17,757 | 18,295 | 17,757 | 19,416 | ||||||||||||||||||
| Accounting Standards Update 2016-02 and 2018-02 | |||||||||||||||||||||||
| Adoption of new accounting standards on June 1, 2019 | [5] | (4) | |||||||||||||||||||||
| Accounting Standards Update 2018-02 | |||||||||||||||||||||||
| Reclassification to retained earnings due to the adoption of a new accounting standard on June 1, 2019 | [6] | 51 | |||||||||||||||||||||
| Common Stock | |||||||||||||||||||||||
| Beginning Balance | 32 | 32 | 32 | 32 | 32 | ||||||||||||||||||
| Ending Balance | 32 | 32 | 32 | 32 | 32 | ||||||||||||||||||
| Additional Paid-In Capital | |||||||||||||||||||||||
| Beginning Balance | 3,231 | 3,117 | 3,231 | 3,117 | 3,005 | ||||||||||||||||||
| Employee incentive plans and other | 125 | 114 | 112 | ||||||||||||||||||||
| Ending Balance | 3,356 | 3,231 | 3,356 | 3,231 | 3,117 | ||||||||||||||||||
| Retained Earnings | |||||||||||||||||||||||
| Beginning Balance | 24,648 | 24,823 | 24,648 | 24,823 | 20,833 | ||||||||||||||||||
| Net income | 1,286 | 540 | 4,572 | ||||||||||||||||||||
| Cash dividends declared | (679) | (683) | (535) | ||||||||||||||||||||
| Employee incentive plans and other | (35) | (32) | (47) | ||||||||||||||||||||
| Ending Balance | 25,216 | 24,648 | 25,216 | 24,648 | 24,823 | ||||||||||||||||||
| Retained Earnings | Accounting Standards Update 2016-02 and 2018-02 | |||||||||||||||||||||||
| Adoption of new accounting standards on June 1, 2019 | [5] | (4) | |||||||||||||||||||||
| Accumulated Other Comprehensive Loss | |||||||||||||||||||||||
| Beginning Balance | (865) | (578) | (865) | (578) | (415) | ||||||||||||||||||
| Other comprehensive loss, net of tax | (333) | (287) | (163) | ||||||||||||||||||||
| Ending Balance | (1,147) | (865) | (1,147) | (865) | (578) | ||||||||||||||||||
| Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02 | |||||||||||||||||||||||
| Reclassification to retained earnings due to the adoption of a new accounting standard on June 1, 2019 | [6] | 51 | |||||||||||||||||||||
| Treasury Stock | |||||||||||||||||||||||
| Beginning Balance | $ (9,289) | $ (7,978) | (9,289) | (7,978) | (7,382) | ||||||||||||||||||
| Purchase of treasury stock | (3) | (1,480) | (1,017) | ||||||||||||||||||||
| Employee incentive plans and other | 130 | 169 | 421 | ||||||||||||||||||||
| Ending Balance | $ (9,162) | $ (9,289) | $ (9,162) | $ (9,289) | $ (7,978) | ||||||||||||||||||
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