Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Income taxes
Effective tax rate on income from continuing operations (as a percent)	20.80%	18.10%	19.20%	15.40%
Valuation allowance, deferred tax assets	$ 30		$ 30		$ 32
Gross unrecognized tax benefits	136		136		125
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized	103		103		95
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months	40		40
Increase (decrease) in interest and penalties	1	$ 0	2	$ (1)
Payable related to accrued interest and penalties	12		12		$ 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	16		16
State
Income taxes
Deferred tax assets, loss carryforwards	12		12
Foreign
Income taxes
Deferred tax assets, loss carryforwards	$ 37		$ 37