Income Taxes (Details 6) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of unrecognized income tax benefits
Unrecognized tax benefits, beginning of year	$ 119	$ 0	$ 4
Additions for income tax positions related to current year	0	119	0
Reductions for income tax positions related to settlements	0	0	(4)
Unrecognized tax benefits, end of year	119	119	0
Unrecognized tax benefits that, if recognized, would impact the effective tax rate	119	119	0
Recognized interest and penalties		(1)	$ 2
Maximum
Reconciliation of unrecognized income tax benefits
Recognized interest and penalties	1
Accrued interest and penalties	$ 1	$ 1