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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total revenues	$ 8,786	$ 8,792	$ 8,080	$ 8,398	$ 7,605	$ 5,873	$ 6,078	$ 6,667	$ 34,055	$ 26,223	$ 20,182
Gross margin	1,399	567	168	460	327	112	325	665	2,593	1,429
Operating income	1,315	493	88	381	261	44	257	591	2,277	1,153	994
Net income	1,117	710	100	288	191	34	189	444	2,216	858	730
Net income attributable to PAA	$ 1,117	$ 710	$ 100	$ 288	$ 191	$ 33	$ 188	$ 444	$ 2,216	$ 856	$ 726
Cash distributions per common unit (in dollars per unit)	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.55	$ 0.55	$ 0.55	$ 1.20	$ 1.95
Common Units
Basic net income/(loss) per common unit (in dollars per unit)	1.46	0.91	0.07	0.33	0.19	(0.01)	0.21	0.59	2.77	0.96	$ 0.43
Diluted net income/(loss) per common unit (in dollars per unit)	$ 1.38	$ 0.87	$ 0.07	$ 0.33	$ 0.19	$ (0.01)	$ 0.21	$ 0.58	$ 2.71	$ 0.95	$ 0.43

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