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Consolidated and Combined Statements of Changes in Equity - USD ($)
shares in Millions, $ in Millions
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Net Parent Investment [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance, beginning of period at Dec. 31, 2015       $ 516 $ 2 $ 518
Net income       124   124
Stock-based employee compensation       4   4
Net transfers to Parent       (84)   (84)
Other comprehensive loss, net of tax         (2) (2)
Balance, end of period at Dec. 31, 2016       560   560
Net income       160   160
Stock-based employee compensation       4   4
Net transfers to Parent       (63)   (63)
Balance, end of period at Dec. 31, 2017       661   661
Net income     $ 17 108   125
Stock-based employee compensation   $ 1   3   4
Adoption of ASC 606       2   2
Net transfers to Parent       (127)   (127)
Non-cash distribution to Parent       (1,000)   (1,000)
Reclassification of Net Parent Investment     (352) $ 352    
Issuance of common stock at Spin-off, value $ 1   (1)      
Issuance of common stock at Spin-off, shares 85          
Other comprehensive loss, net of tax         (9) (9)
Balance, end of period at Dec. 31, 2018 $ 1 $ 1 $ (336)   $ (9) $ (344)
Balance, shares at Dec. 31, 2018 85