Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income tax expense from continuing operations	$ 143	$ 95	$ 354	$ 3
Release of valuation allowance			$ 78
Income tax benefit from discontinued operations	2
Foreign tax credit carryforwards	78
Valuation allowance	$ 76