Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2020	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Irish or Swiss Income Tax rate at 25.0% and 7.83%, respectively	$ 2	$ (299)	$ 454	$ 216
Tax on Operating Earnings/Losses Subject to Rates Different than the Irish or Swiss Federal Income Tax Rate	(65)	197	(182)	(387)
Change in Valuation Allowance	56	17	(330)	166
Change in Uncertain Tax Positions	(2)	(18)	(27)	(29)
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount	0	(495)	0	0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	0	463	0	0
Provision for Income Taxes	$ (9)	$ (135)	$ (85)	$ (34)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	25.00%	7.83%	25.00%	7.83%