| Stockholders' Equity - Quarterly Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | ||
|---|---|---|---|
| Jan. 29, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | |
| Equity [Abstract] | |||
| Dividends Per Share (in dollars per share) | $ 0.0121 | $ 0.0121 | $ 0.0110 | 
| Total Amount | $ 57 | ||
| X | ||||||||||
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- References No definition available. 
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