CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Cash Flows [Abstract]
Cash acquired for Level 3 acquisition		$ 2,300
Interest paid (net of capitalized interest of $72, $53 and $78)	$ 72	$ 53	$ 78