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Income Per Common Share - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | May 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Amount authorized for repurchase |  |  | $ 1,500,000,000
Stock repurchased during period (in shares) | 3,500,000 |  |
Stock Repurchased and Retired During Period, Value | $ 122,000,000 | $ 150,000,000 |
Payments for Repurchase of Common Stock | 116,000,000 | $ 150,000,000 |
Remaining amount authorized to be repurchased | $ 513,000,000 |  |
Dividends |  |  |
Cash dividends per common share paid (in dollars per share) | $ 0.120 | $ 0.105 |
Cash dividends per common share declared (in dollars per share) | $ 0.120 | $ 0.105 |
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) | 1,100,000 | 431,000 |
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 |  |
Stock repurchased and retired during period to offset dilutive impact of awards granted (in shares) | 600,000 |  |

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