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Income Per Common Share - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | May 31, 2017
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) |  |  |  |  |  |  | 11,500,000 |  |
Stock repurchased and retired during period | $ 151,000,000 | $ 167,000,000 | $ 122,000,000 | $ 89,000,000 | $ 115,000,000 | $ 150,000,000 | $ 440,000,000 |  |
Remaining authorized repurchase amount | $ 1,960,000,000 |  |  |  |  |  | $ 1,960,000,000 |  |
Dividends |  |  |  |  |  |  |  |  |
Cash dividends per common share paid (in dollars per share) | $ 0.120 |  |  | $ 0.105 |  |  | $ 0.360 | $ 0.315 |
Cash dividends per common share declared (in dollars per share) | $ 0.135 |  |  | $ 0.120 |  |  | $ 0.375 | $ 0.330 |
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) | 855,000 |  |  | 668,000 |  |  | 1,200,000 | 627,000 |
Long-term stock awards |  |  |  |  |  |  |  |  |
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 |  |
Stock repurchased and retired during period to offset dilutive impact of awards granted (in shares) |  |  |  |  |  |  | 600,000 |  |

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