CONSOLIDATED AND COMBINED STATEMENTS OF EQUITY (DEFICIT) - USD ($) shares in Millions, $ in Millions	Total	Cumulative-Effect Adjustment	Before Spin-Off	After Spin-Off	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative-Effect Adjustment	Retained Earnings After Spin-Off	Invested Deficit	Invested Deficit Before Spin-Off	Other Comprehensive Income/(loss)
Beginning balance at Dec. 31, 2017	$ (2,195)									$ (2,433)		$ 238
Net income	1,206		$ 1,137	$ 69					$ 69		$ 1,137
Other comprehensive income, net of tax	(165)											(165)
Change in Invested deficit	(1,168)									(1,168)
Spin-Off related adjustments	(200)									(200)
Issuance of common stock and reclassification of invested deficit							$ (2,664)			$ 2,664
Issuance of common stock and reclassification of invested deficit, Shares					74
Stock-based compensation	5					$ 5
Ending balance at Dec. 31, 2018	(2,517)					5	(2,595)					73
Ending balance, Shares at Dec. 31, 2018					74
Net income	313						313
Other comprehensive income, net of tax	57											57
Stock-based compensation	18					18
Stock based compensation, Shares					1
Tax withholding related to vesting of restricted stock units and other	(4)					(4)
Ending balance at Dec. 31, 2019	(2,133)	$ (5)				19	(2,282)	$ (5)				130
Ending balance, Shares at Dec. 31, 2019					75
Net income	80						80
Other comprehensive income, net of tax	(259)											(259)
Stock-based compensation	10					10
Stock based compensation, Shares					1
Tax withholding related to vesting of restricted stock units and other	(1)					(1)
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member						us-gaap:AccountingStandardsUpdate201613Member
Ending balance at Dec. 31, 2020	$ (2,308)					$ 28	$ (2,207)					$ (129)
Ending balance, Shares at Dec. 31, 2020					76