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Stock Plans - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	9 Months Ended		12 Months Ended	60 Months Ended
	Jan. 31, 2018	Oct. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2013
Class of Stock [Line Items]
Common shares repurchased			$ 1,636,000,000		$ 2,202,000,000
Payments for Repurchase of Common Stock			$ 1,650,000,000	$ 1,786,000,000
Common Stock | Prior to January 1, 2018
Class of Stock [Line Items]
Stock repurchase value							$ 13,700,000,000
Common shares repurchased						$ 13,000,000,000.0
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
Number of shares repurchased (in shares)			39
Average cost of shares repurchased (in dollars per share)			$ 41.98
Common shares repurchased			$ 1,700,000,000
Stock repurchase remaining amount			$ 5,000,000,000.0
Common Stock | Share Repurchase Program Amended January 1, 2018 | Subsequent Event
Class of Stock [Line Items]
Payments for Repurchase of Common Stock		$ 12,000,000

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