Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Income taxes
Effective tax rate on income from continuing operations (as a percent)	17.60%	11.30%
Valuation allowance, deferred tax assets	$ 32		$ 32
Gross unrecognized tax benefits	130		125
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized	99		95
Increase (decrease) in interest and penalties	1	$ (2)
Payable related to accrued interest and penalties	11		10
State net operating losses
Income taxes
Valuation allowance, deferred tax assets	11		11
State deferred tax assets
Income taxes
Valuation allowance, deferred tax assets	3		3
Foreign net operating losses
Income taxes
Valuation allowance, deferred tax assets	18		$ 18
Minimum
Income taxes
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months	35
Maximum
Income taxes
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months	45
State
Income taxes
Deferred tax assets, loss carryforwards	12
Foreign
Income taxes
Deferred tax assets, loss carryforwards	$ 40