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Equity - Capital Stock (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 02, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |
Preferred stock authorized (shares) |  | 2,000,000 |  |
Par value of Preferred stock (in usd per share) |  | $ 1 |  |
Preferred stock issued (in shares) |  | 0 |  |
Dividend history |  |  |  |
Quarterly dividend rate (in usd per share) |  | $ 0.41 | $ 0.36 | $ 0.330
Annualized dividend rate (in usd per share) |  | $ 1.64 | $ 1.44 | $ 1.32
Dividends paid |  | $ 421 | $ 380 | $ 363
Subsequent Event |  |  |  |
Dividend history |  |  |  |
Quarterly dividend rate (in usd per share) | $ 0.50 |  |  |

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