Basis of Financial Statements - Income Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income tax expense	$ 89	$ 86	$ 61	$ 151
Income tax expense as percentage of earnings before income taxes, percent	22.00%	24.00%	19.00%	24.00%