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Income Per Common Share - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 17, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Amount authorized for repurchase |  |  |  |  |  |  |  |  | $ 2,000,000,000.0
Stock repurchased during period (in shares) |  |  |  |  |  |  | 16,500,000 |  |
Stock repurchased and retired during period |  | $ 0 | $ 602,000,000 | $ 151,000,000 | $ 167,000,000 | $ 122,000,000 | $ 602,000,000 |  |
Remaining authorized repurchase amount | $ 900,000,000 |  |  |  |  |  | $ 900,000,000 |  |
Dividends |  |  |  |  |  |  |  |  |
Cash dividends per common share paid (in dollars per share) | $ 0.135 |  |  | $ 0.120 |  |  | $ 0.405 | $ 0.360 |
Cash dividends per common share declared (in dollars per share) | $ 0.140 |  |  | $ 0.135 |  |  | $ 0.410 | $ 0.375 |
Stock options |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Antidilutive effect on computation of diluted earnings per common share (in shares) | 106,000 |  |  | 855,000 |  |  | 685,000 | 1,200,000 |
Performance Restricted Stock Units |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Antidilutive effect on computation of diluted earnings per common share (in shares) |  |  |  | 20,000 |  |  |  | 20,000 |
Long-term stock awards |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased and retired during period to offset dilutive impact of awards granted (in shares) |  |  |  |  |  |  | 400,000 |  |
Common Stock |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased during period, additional shares (in shares) | 1,200,000 |  |  |  |  |  |  |  |

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