Stockholders' Equity - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |
---|---|---|---|
Mar. 31, 2018 |
Dec. 31, 2018 |
Dec. 31, 2019 |
|
Equity [Abstract] | |||
Treasury stock, number of shares held | 20,320,777 | 20,320,777 | |
Treasury stock, value | $ 19 | $ 19 | |
Accumulated Other Comprehensive Income (Loss) [Line Items] | |||
Reclassification of stranded tax effect | 0 | ||
Retained Income | |||
Accumulated Other Comprehensive Income (Loss) [Line Items] | |||
Reclassification of stranded tax effect | 88 | ||
Retained Income | Accounting Standards Update 2018-02 | |||
Accumulated Other Comprehensive Income (Loss) [Line Items] | |||
Reclassification of stranded tax effect | $ 88 | ||
Accumulated Other Comprehensive Loss | |||
Accumulated Other Comprehensive Income (Loss) [Line Items] | |||
Reclassification of stranded tax effect | $ (88) | ||
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02 | |||
Accumulated Other Comprehensive Income (Loss) [Line Items] | |||
Reclassification of stranded tax effect | $ (88) |