Equity Table - IDR Schedule (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Relinquishment of Rights of Incentive Distributions	$ 26	$ 35	$ 45	$ 50	$ 72	$ 51	$ 80