Equity (Details)		3 Months Ended		9 Months Ended		52 Months Ended
	Aug. 01, 2019 USD ($) shares	Sep. 30, 2020 offering shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) offering shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) offering shares
Limited Partners' Capital Account [Line Items]
Number of common units issued in public offering (in shares) | shares		0	1,635,669	40,570	2,470,037
General Partner Interest To Be Converted Into Non-Economic General Partner Interest
Limited Partners' Capital Account [Line Items]
General partner interest, percent	2.00%
Common Units
Limited Partners' Capital Account [Line Items]
Shares, issued (in shares) | shares	101,000,000
General partners equity balance	$ 1,400,000,000
At The Market Offering Program
Limited Partners' Capital Account [Line Items]
Aggregate authorized amount				$ 750,000,000
At The Market Offering Program | Common Units
Limited Partners' Capital Account [Line Items]
Number of continuous offerings | offering		3		3		3
Authorized amount per program				$ 250,000,000
Number of common units issued in public offering (in shares) | shares		0	1,635,669	40,570	2,470,037	9,487,055
Issuance of common units			$ 91,000,000	$ 2,000,000	$ 133,000,000	$ 494,000,000
Brokers commissions						5,000,000
Other costs						$ 3,000,000