Income Taxes Unrecognized Benefits (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Unrecognized tax benefit - Permanent tax positions		$ 3	$ 3
Unrecognized tax benefit - Temporary tax positions		4	4
Total unrecognized tax benefit		7	7
NOL and tax credit carryforwards		7	6
Reasonably possible decrease in unrecognized tax benefits		5
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		(1)	(1)	$ 1
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ (2)	0
Penalties related to unrecognized tax benefits		$ 0	$ 0