CONSOLIDATED AND COMBINED INTERIM STATEMENTS OF EQUITY (DEFICIT) (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Invested Deficit	Accumulated Other Comprehensive Income/(loss)
Beginning balance at Dec. 31, 2017	$ (2,195)				$ (2,433)	$ 238
Net income	58				58
Other comprehensive income, net of tax	(184)					(184)
Change in Invested deficit	1,080				1,080
Ending balance at Mar. 31, 2018	(1,241)				(1,295)	54
Beginning balance at Dec. 31, 2017	(2,195)				(2,433)	238
Net income	1,137
Other comprehensive income, net of tax	(230)					(230)
Ending balance at Sep. 30, 2018	(2,456)				(2,464)	8
Beginning balance at Mar. 31, 2018	(1,241)				(1,295)	54
Net income	150				150
Other comprehensive income, net of tax	(45)					(45)
Change in Invested deficit	(672)				(672)
Ending balance at Jun. 30, 2018	(1,808)				(1,817)	9
Net income	929				929
Other comprehensive income, net of tax	(1)					(1)
Change in Invested deficit	(1,576)				(1,576)
Ending balance at Sep. 30, 2018	(2,456)				$ (2,464)	8
Beginning balance at Dec. 31, 2018	(2,593)		$ 5	$ (2,671)		73
Beginning balance, Shares at Dec. 31, 2018		74
Net income	73			73
Other comprehensive income, net of tax	63					63
Stock-based compensation	5		5
Stock based compensation, Shares		1
Ending balance at Mar. 31, 2019	(2,452)		10	(2,598)		136
Ending balance, Shares at Mar. 31, 2019		75
Beginning balance at Dec. 31, 2018	(2,593)		5	(2,671)		73
Beginning balance, Shares at Dec. 31, 2018		74
Net income	177
Other comprehensive income, net of tax	138					138
Ending balance at Sep. 30, 2019	(2,264)		19	(2,494)		211
Ending balance, Shares at Sep. 30, 2019		75
Beginning balance at Mar. 31, 2019	(2,452)		10	(2,598)		136
Beginning balance, Shares at Mar. 31, 2019		75
Net income	66			66
Other comprehensive income, net of tax	(35)					(35)
Stock-based compensation	4		4
Ending balance at Jun. 30, 2019	(2,417)		14	(2,532)		101
Ending balance, Shares at Jun. 30, 2019		75
Net income	38			38
Other comprehensive income, net of tax	110					110
Stock-based compensation	5		5
Ending balance at Sep. 30, 2019	$ (2,264)		$ 19	$ (2,494)		$ 211
Ending balance, Shares at Sep. 30, 2019		75