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Earnings Per Share and Certain Related Information - Share Repurchases (Details) - USD ($) |  | 1 Months Ended
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Jan. 17, 2019 | Jul. 23, 2015
Earnings Per Share [Abstract] |  |
Amount authorized to be repurchased | $ 1,000,000,000.0 | $ 500,000,000
Average cost per share repurchased (in dollars per share) | $ 75.33 | $ 61.74
Number of shares repurchased (in shares) | 3,680,017 | 4,005,007

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