Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Tax (benefit)	$ 103	$ 87	$ 158	$ 202
Income from continuing operations before income taxes	$ 342	$ 380	$ 496	$ 856
Effective tax rate (as a percent)	30.00%	23.00%	32.00%	24.00%
Income tax expense, elimination of disproportionate tax			$ 16
Reduction in income tax expense		$ 10		$ 13
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 10		$ 15