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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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