Equity (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended			43 Months Ended
	Aug. 01, 2019 USD ($) shares	Oct. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares	Dec. 31, 2019 USD ($) offering shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2019 USD ($) offering shares
Limited Partners' Capital Account [Line Items]
Number of common units issued in public offering (in shares) | shares				3,195,521	2,532,096	3,372,716
General partner interest, percent	2.00%
Units issued in preferred offering (in shares) | shares						20,123,995
Issuance of preferred units				$ 0	$ 0	$ 737
Common Units
Limited Partners' Capital Account [Line Items]
Shares, issued (in shares) | shares	101,000,000
General partners equity balance	$ 1,400
Units issued in preferred offering (in shares) | shares		6,304,204
Price per common limited partner unit (in usd per share) | $ / shares		$ 47.59
Partners' capital account, private sale of units net of offering costs		$ 295
Preferred Unitholders Public
Limited Partners' Capital Account [Line Items]
Units issued in preferred offering (in shares) | shares		13,819,791
Price per common limited partner unit (in usd per share) | $ / shares		$ 54.27
Issuance of preferred units		$ 737
Cumulative distribution, quarterly for three years (in usd per share) | $ / shares			$ 0.678375
Average of the volume-weighted trading price, threshold (in usd per share) | $ / shares		$ 73.2645
Preferred units, convertible, threshold consecutive trading days		20 days
Convertible threshold average trading volume common units (in shares) | shares		100,000
At The Market Offering Program
Limited Partners' Capital Account [Line Items]
Total authorized amount				$ 750
At The Market Offering Program | Common Units
Limited Partners' Capital Account [Line Items]
Number of continuous offerings | offering				3			3
Equity offering program, authorized amount, per program				$ 250	$ 250
Number of common units issued in public offering (in shares) | shares				3,195,521	2,532,096	3,372,716	9,446,485
Issuance of common units				$ 173	$ 128	$ 173	$ 492
Brokers commissions							5
Other costs							$ 3