CONSOLIDATED 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, 2018	$ (2,517)		$ 5	$ (2,595)		$ 73
Beginning balance, Shares at Dec. 31, 2018		74
Net income (loss)	73			73	$ 0
Other comprehensive income (loss), net of tax	63					63
Stock-based compensation	5		5
Stock based compensation, Shares		1
Ending balance at Mar. 31, 2019	(2,376)		10	(2,522)		136
Ending balance, Shares at Mar. 31, 2019		75
Beginning balance at Dec. 31, 2018	(2,517)		5	(2,595)		73
Beginning balance, Shares at Dec. 31, 2018		74
Net income (loss)	139
Other comprehensive income (loss), net of tax	28					28
Ending balance at Jun. 30, 2019	(2,341)		14	(2,456)		101
Ending balance, Shares at Jun. 30, 2019		75
Beginning balance at Mar. 31, 2019	(2,376)		10	(2,522)		136
Beginning balance, Shares at Mar. 31, 2019		75
Net income (loss)	66			66
Other comprehensive income (loss), net of tax	(35)					(35)
Stock-based compensation	4		4
Ending balance at Jun. 30, 2019	(2,341)		14	(2,456)		101
Ending balance, Shares at Jun. 30, 2019		75
Beginning balance at Dec. 31, 2019	(2,133)		19	(2,282)		130
Beginning balance, Shares at Dec. 31, 2019		75
Net income (loss)	52			52
Other comprehensive income (loss), net of tax	39					39
Stock-based compensation	2		2
Tax withholding related to vesting of restricted stock units and other	(1)		(1)
Adoption impact of ASU 2016-13, Financial Instruments - Credit Losses	(5)			(5)
Ending balance at Mar. 31, 2020	(2,046)		20	(2,235)		169
Ending balance, Shares at Mar. 31, 2020		75
Beginning balance at Dec. 31, 2019	(2,133)		19	(2,282)		130
Beginning balance, Shares at Dec. 31, 2019		75
Net income (loss)	43
Other comprehensive income (loss), net of tax	(13)					(13)
Ending balance at Jun. 30, 2020	(2,103)		24	(2,244)		117
Ending balance, Shares at Jun. 30, 2020		75
Beginning balance at Mar. 31, 2020	(2,046)		20	(2,235)		169
Beginning balance, Shares at Mar. 31, 2020		75
Net income (loss)	(9)			(9)
Other comprehensive income (loss), net of tax	(52)					(52)
Stock-based compensation	4		4
Ending balance at Jun. 30, 2020	$ (2,103)		$ 24	$ (2,244)		$ 117
Ending balance, Shares at Jun. 30, 2020		75