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Stock Plans - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions			3 Months Ended	9 Months Ended		96 Months Ended
	Dec. 02, 2020	Jan. 31, 2018	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2018
Class of Stock [Line Items]
Common shares repurchased			$ 326,000,000	$ 1,794,000,000	$ 701,000,000
Common Stock
Class of Stock [Line Items]
Stock repurchase value							$ 13,700,000,000
Common shares repurchased				$ 1,800,000,000
Number of shares repurchased (in shares)				31.0
Average cost of shares repurchased (in dollars per share)				$ 58.72
Remaining share repurchase capacity			$ 4,000,000,000	$ 4,000,000,000
Common Stock | Share Repurchase Program Amended January 31, 2018
Class of Stock [Line Items]
Stock repurchase value		$ 19,700,000,000
Increase in share repurchase value		$ 6,000,000,000
Common Stock | Share Repurchase Program Amended December 2, 2020
Class of Stock [Line Items]
Stock repurchase value	$ 23,700,000,000
Increase in share repurchase value	$ 4,000,000,000
Common Stock | Prior to January 1, 2021
Class of Stock [Line Items]
Common shares repurchased						$ 18,000,000,000

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