Accumulated Other Comprehensive Income (Change in AOCI, Net of Tax) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 2,207	$ 1,994	$ 2,137	$ 1,825
Other comprehensive (loss) income before reclassifications			14
Amounts reclassified from AOCI			(11)
Total other comprehensive income	26	10	3	30
Ending Balance	2,338	2,102	2,338	2,102
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(20)
Other comprehensive (loss) income before reclassifications			(11)
Amounts reclassified from AOCI			0
Total other comprehensive income			(11)
Ending Balance	(31)		(31)
Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(36)
Other comprehensive (loss) income before reclassifications			25
Amounts reclassified from AOCI			(3)
Total other comprehensive income			22
Ending Balance	(14)		(14)
Actuarial Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			51
Other comprehensive (loss) income before reclassifications			0
Amounts reclassified from AOCI			(10)
Total other comprehensive income			(10)
Ending Balance	41		41
Prior Service (Cost) Credit
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(20)
Other comprehensive (loss) income before reclassifications			0
Amounts reclassified from AOCI			2
Total other comprehensive income			2
Ending Balance	(18)		(18)
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(48)	(14)	(25)	(34)
Total other comprehensive income	26	10	3	30
Ending Balance	$ (22)	$ (4)	$ (22)	$ (4)