v3.19.3.a.u2
Supplemental Financial Statement Information - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Stockholders' equity, beginning balance $ (7,385)    
Other comprehensive income (loss) before reclassifications 1 $ (185) $ (4)
Other comprehensive income (loss) 1 (185) (4)
Stockholders' equity, ending balance 14,190 (7,385)  
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Stockholders' equity, beginning balance (188) (3) 1
Stockholders' equity, ending balance (187) (188) (3)
Foreign Currency Translation Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Stockholders' equity, beginning balance (228) (3) 1
Other comprehensive income (loss) before reclassifications (3) (225) (4)
Other comprehensive income (loss) (3) (225) (4)
Stockholders' equity, ending balance (231) (228) (3)
Unrealized Gains (Losses) on Available-for-Sale Securities, Net of Tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Stockholders' equity, beginning balance 40 0 0
Other comprehensive income (loss) before reclassifications 4 40 0
Other comprehensive income (loss) 4 40 0
Stockholders' equity, ending balance $ 44 $ 40 $ 0