Income Taxes - Allocation of Income Tax Expense (Details) - USD ($) $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2017	Oct. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Income tax expense in the consolidated statements of operations:
Attributable to income	$ 234	$ 268	$ 255	$ 196
Member's/Stockholders' equity:
Tax effect of the change in accumulated other comprehensive loss	$ 17	$ 49	$ 5	$ (49)