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No definition available.

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Amount of stock repurchase plan authorized.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stockholders' Equity - Stock Repurchase Programs, Treasury Shares, and Dividends on Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	May 23, 2019	Apr. 30, 2019	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock repurchased (in shares)					1.9
Common stock repurchased, value		$ 5	$ 135	$ 19	$ 413	$ 272
Common stock, dividends, per share, cash paid (in dollars per share)					$ 1.41
Dividends declared			$ 126	$ 102	$ 376	$ 304
Cash dividends declared per common share (in dollars per share)			$ 0.47	$ 0.39	$ 1.41	$ 1.17
Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividends declared per common share (in dollars per share)	$ 0.47
New Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, remaining authorized repurchase amount		$ 2,800	$ 2,800		$ 2,800
Retained Earnings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared			$ 126	$ 102	$ 376	$ 304