Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Other property and equipment, net	[1]	$ 1,003	$ 1,035
Common stock, par value (in dollars per share)		$ 0.10	$ 0.10
Common stock, shares authorized (in shares)		1,000,000,000.0	1,000,000,000.0
Common stock, shares issued (in shares)		383,000,000	382,000,000
CDM [Member]
Other property and equipment, net		$ 100	$ 80

[1] $100 million and $80 million related to CDM in 2020 and 2019, respectively.