Income Taxes Schedule of Unrecognized Tax Benefits Roll Forward (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 12, 2019	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 214		$ 195	$ 217	$ 213	$ 208
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0	$ 34	31	65
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	0	(1)	(9)	(1)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	2	17	14	12
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(1)	(20)	(18)	(29)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	(5)	(23)	(38)
Unrecognized Tax Benefits, Increase (Decrease) Resulting from Foreign Currency Translation	$ 0	$ (7)	$ (17)	$ 0