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Capital Stock - Narrative (Details) - USD ($)			1 Months Ended	12 Months Ended			84 Months Ended
	Dec. 02, 2020	Jan. 31, 2018	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, shares authorized (in shares)				5,000,000,000	5,000,000,000		5,000,000,000
Preferred stock, shares issued (in shares)				0	0	0	0
Preferred stock, shares outstanding (in shares)				0	0	0	0
Amount of shares repurchased				$ 1,401,000,000	$ 1,499,000,000	$ 1,994,000,000
Class A Common Stock, no par value
Class of Stock [Line Items]
Common stock, shares authorized (in shares)				5,000,000,000.0
Preferred stock, shares authorized (in shares)				500,000,000
Common stock reserved for stock option and other stock awards (in shares)				85,800,000
Stock repurchase value						$ 13,700,000,000
Amount of shares repurchased				$ 1,400,000,000
Number of shares repurchased (in shares)				25,071,845	30,902,465	47,258,884
Average cost of shares repurchased (in dollars per share)				$ 55.87
Stock repurchase remaining amount				$ 5,800,000,000
Class A Common Stock, no par value | 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
Class A Common Stock, no par value | Share Repurchase Program amended December 2, 2020
Class of Stock [Line Items]
Stock repurchase value	$ 23,700,000,000
Increase in share repurchase value	$ 4,000,000,000.0
Stock repurchase expiration date	Dec. 31, 2023
Common Stock | Subsequent Event
Class of Stock [Line Items]
Amount of shares repurchased			$ 30,000,000
Common Stock | Prior to January 1, 2020
Class of Stock [Line Items]
Amount of shares repurchased							$ 16,500,000,000

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