Redeemable Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Apr. 30, 2018	Sep. 30, 2020	Dec. 31, 2019	[1]
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 756	$ 739
Preferred Stock, Redemption Price Per Share		$ 825
USAC [Member]
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 477
USAC [Member] | Preferred Units [Member]
Noncontrolling Interest [Line Items]
Preferred Units, Issued		500,000
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 24.375
ETO [Member]
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 15
SemCAMS [Member]
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 264
Preferred Stock, Shares Outstanding		337,046
Canada, Dollars
Noncontrolling Interest [Line Items]
Preferred Stock, Redemption Price Per Share		$ 1,100

[1] *As adjusted. See Note 1.