Consolidated Statements of Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Excise tax collections included in Revenue	$ 362	$ 373	$ 386
Income tax benefit	$ 59	$ 5	$ 1,300