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Description of Business and Summary of Significant Accounting Policies (Reclassification from AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Realized losses (gains) on derivative instruments: |  |  |
Foreign exchange contracts | $ 26,926 | $ 25,335 | $ 23,369
Interest rate contracts | 130 | 174 | 188
Actuarial (gain) loss | (10) | (3) | 1
Prior service cost | 1 | 0 | 0
(Gain) loss on securities | 2 | (49) | (30)
Total amounts reclassified from AOCI | (944) | (261) | (451)
Reclassification out of AOCI |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Total amounts reclassified from AOCI | (56) | 47 | 54
Reclassification out of AOCI | Realized losses (gains) on derivative instruments |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Loss to be reclassified in next 12 months | 6 |  |
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Foreign exchange contracts |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Foreign exchange contracts | (44) | 15 | 22
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Interest rate contracts |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Interest rate contracts | 3 | (1) | (2)
Reclassification out of AOCI | Actuarial (gain) loss |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Actuarial (gain) loss | (16) | (3) | 1
Reclassification out of AOCI | Available for sale securities |  |  |
Realized losses (gains) on derivative instruments: |  |  |
(Gain) loss on securities | 0 | 36 | 33
Reclassification out of AOCI | Prior service cost |  |  |
Realized losses (gains) on derivative instruments: |  |  |
Prior service cost | $ 1 | $ 0 | $ 0

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