Income Taxes Uncertain tax positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	$ 9	$ 11	$ 38	$ 41
Tax positions taken in current year	1	1	1
Tax positions taken in prior years	0	1	0
Settlements during the year	0	0	(4)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	3	29	$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Paid	0	$ 0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 9