Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 17	$ 18	$ 14
Charged to operations	5	4	7
Credited to operations	(5)	(5)	(3)
Balance at end of year	17	17	18
Deferred Tax Valuation Allowance [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	0	0	1
Charged to operations	0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Addition, Recovery	0	0	1
Balance at end of year	$ 0	$ 0	$ 0