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Capital Structure - Common Stock (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended | 33 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2019 | Feb. 01, 2019 | Jan. 23, 2019 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Feb. 28, 2019
Common Stock, Employee Stock Purchase Plan and Share Repurchases |  |  |  |  |  |  |  |  |
Dividends paid per share (in usd per share) |  |  |  | $ 0.145 |  |  |  | $ 0.030 |
Common stock dividends, proposed annual percentage decrease |  |  |  |  |  |  | 79.00% |  |
Dividends per common share (in usd per share) |  |  |  |  | $ 0.12 | $ 0.12 | $ 0.24 |  |
Eligible compensation withholding, up to (as a percent) |  |  |  |  | 10.00% |  |  |  |
Exercise price as a percentage of fair value (as a percent) |  |  |  |  | 85.00% |  |  |  |
Treasury stock reserved for issuance under the ESPP (in shares) |  |  |  |  | 2,931,188 |  |  | 2,931,188 |
Capital Allocation Plan |  |  |  |  |  |  |  |  |
Common Stock, Employee Stock Purchase Plan and Share Repurchases |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 1,500,000,000.0 |  |  | $ 1,500,000,000.0 |
Subsequent Event |  |  |  |  |  |  |  |  |
Common Stock, Employee Stock Purchase Plan and Share Repurchases |  |  |  |  |  |  |  |  |
Dividends payable, date declared |  |  | Jan. 23, 2019 |  |  |  |  |  |
Dividends per common share (in usd per share) |  |  | $ 0.00030 |  |  |  |  |  |
Dividends payable, date to be paid | Feb. 15, 2019 |  |  |  |  |  |  |  |
Dividends payable, date of record |  | Feb. 01, 2019 |  |  |  |  |  |  |
Subsequent Event | Capital Allocation Plan |  |  |  |  |  |  |  |  |
Common Stock, Employee Stock Purchase Plan and Share Repurchases |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 1,000,000,000
Scenario, Plan |  |  |  |  |  |  |  |  |
Common Stock, Employee Stock Purchase Plan and Share Repurchases |  |  |  |  |  |  |  |  |
Common stock, dividends, proposed annual amount, per share |  |  |  | $ 0.58 |  |  | $ 0.0012 |  |
Scenario, Plan | Subsequent Event |  |  |  |  |  |  |  |  |
Common Stock, Employee Stock Purchase Plan and Share Repurchases |  |  |  |  |  |  |  |  |
Common stock, dividends, proposed annual amount, per share |  |  | $ 0.0012 |  |  |  |  |  |
Long-term incentive plans |  |  |  |  |  |  |  |  |
Common Stock, Employee Stock Purchase Plan and Share Repurchases |  |  |  |  |  |  |  |  |
Long-term incentive plans (in shares) |  |  |  |  | 17,631,031 |  |  | 17,631,031 |

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