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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)