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Earnings Per Share - Narrative (Details) shares in Thousands | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) agreement shares | Dec. 31, 2017 USD ($) shares | Sep. 30, 2019 shares | Aug. 31, 2019 USD ($) | Jan. 31, 2019 USD ($) | Feb. 28, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2015 USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) | shares | 48,000 | 72,000 | 39,000 |  |  |  |  |  |  |  |
Amount of shares repurchased | $ 3,373,000,000 | $ 4,671,000,000 | $ 1,970,000,000 |  |  |  |  |  |  |  |
Share Repurchase Program January 2019 |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  |  | $ 5,000,000,000 |  |  |  |  |
Share repurchase program, remaining amount |  |  |  |  |  | $ 1,800,000,000 |  |  |  |  |
Share Repurchase Program January 2019 | 2019 |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase program payment |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Accelerated share repurchase program initial shares received (in shares) | shares |  |  |  | 4,000 |  |  |  |  |  |  |
Share Repurchase Program October 2017 |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  |  |  | $ 5,000,000,000 | $ 1,500,000,000 |  |  |
Share Repurchase Program October 2017 | 2018 |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) | shares |  | 22,000 |  |  |  |  |  |  |  |  |
Accelerated share repurchase program payment |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Number of accelerated share repurchase agreements entered into by the Company | agreement |  | 4 |  |  |  |  |  |  |  |  |
Share Repurchase Program April 2017 |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  |  |  |  |  | $ 1,500,000,000 | $ 1,000,000,000 |
Share Repurchase Program April 2015 |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000
Stock Options |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities (in shares) | shares | 877 | 479 | 7,600 |  |  |  |  |  |  |  |

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