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Stock Plans - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended		9 Months Ended		72 Months Ended
	Jan. 31, 2018	Oct. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2013
Class of Stock [Line Items]
Common shares repurchased			$ 206,000,000	$ 486,000,000	$ 1,147,000,000	$ 1,636,000,000
Repurchase of common stock					1,143,000,000	$ 1,650,000,000
Common Stock | Prior to January 1, 2018
Class of Stock [Line Items]
Stock repurchase value								$ 13,700,000,000
Common shares repurchased							$ 15,000,000,000.0
Common Stock | Share Repurchase Program Amended January 1, 2018
Class of Stock [Line Items]
Stock repurchase value	$ 19,700,000,000
Increase in share repurchase value	$ 6,000,000,000.0
Stock repurchase expiration date	Dec. 31, 2020
Common shares repurchased					$ 1,200,000,000
Number of shares repurchased (in shares)					24
Average cost of shares repurchased (in dollars per share)					$ 47.21
Remaining share repurchase capacity			$ 3,500,000,000		$ 3,500,000,000
Common Stock | Share Repurchase Program Amended January 1, 2018 | Subsequent Event
Class of Stock [Line Items]
Repurchase of common stock		$ 5,000,000

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