Income Taxes Level 4 (Details) - Components of Income Tax Expense - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Current [Abstract]
Federal	$ 0	$ 38	$ 0	$ 0
State and local	3	13	2	2
Foreign	0	14	26	19
Total current	3	65	28	21
Deferred [Abstract]
Federal	11	(1)	1	(5)
State and local	1	0	0	0
Foreign	(24)	158	11	2
Total deferred	(12)	157	12	(3)
Income tax (benefit) expense	$ (9)	$ 222	$ 40	$ 18
Federal Statutory Income Tax Rate	21.00%	21.00%	21.00%	35.00%