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Partners' Capital and Distributions - Common Unit Distributions (Details) - Common Units - USD ($) $ / shares in Units, $ in Millions			3 Months Ended								12 Months Ended
	Feb. 14, 2020	Jan. 08, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Distribution Made to Limited Partner [Line Items]
Distributions per common unit (in dollars per unit)			$ 0.36	$ 0.36	$ 0.36	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 1.38	$ 1.20
Cash Distribution
Distribution Made to Limited Partner [Line Items]
Distributions paid to limited partners											$ 1,004	$ 871	$ 1,386
Distributions per common unit (in dollars per unit)											$ 1.38	$ 1.20	$ 1.95
Public | Cash Distribution
Distribution Made to Limited Partner [Line Items]
Distributions paid to limited partners											$ 632	$ 532	$ 849
AAP | Cash Distribution
Distribution Made to Limited Partner [Line Items]
Distributions paid to limited partners											$ 372	$ 339	$ 537
Fourth quarter distribution | Subsequent Event | Cash Distribution
Distribution Made to Limited Partner [Line Items]
Distributions paid to limited partners	$ 262
Distribution per common unit declared (in dollars per unit)		$ 0.36
Fourth quarter distribution | Subsequent Event | AAP | Cash Distribution
Distribution Made to Limited Partner [Line Items]
Distributions paid to limited partners	$ 90

X

- Definition

Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

+ References

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