Equity-Indexed Compensation Plans - AAP Management Units (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended			113 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Grant Date Fair Value of Outstanding AAP Management Units:
Equity-indexed compensation expense		$ 60	$ 27	$ 99
AAP Management Units
Equity-Indexed Compensation Plans
Modified (in shares or units)	800,000
Number of units available for grant (in units)		0			0
Unearned units outstanding (in units)		800,000			800,000
Outstanding
Outstanding at the beginning of the period (in units)		19,000,000	18,400,000
Granted (in units)			600,000
Converted (in units)		(15,600,000)
Outstanding at the ending of the period (in units)		3,400,000	19,000,000	18,400,000	3,400,000
Outstanding Units Earned
Outstanding Units Earned, beginning balance (in units)		18,200,000	17,900,000
Earned (in units)			300,000
Converted (in units)		(15,600,000)
Outstanding Units Earned, end balance (in units)		2,600,000	18,200,000	17,900,000	2,600,000
Grant Date Fair Value of Outstanding AAP Management Units:
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance		$ 88	$ 64
Granted			24
Modified		(17)
Converted		(36)
Grant Date Fair Value of Outstanding AAP Management Units, ending balance		35	88	$ 64	$ 35
Equity-indexed compensation expense		$ 2	$ 1	$ 7	$ 22
PAA | AAP Management Units | Minimum
Equity-Indexed Compensation Plans
Annualized distribution level required for units to become earned (in dollars per unit)	$ 2.2
PAA | AAP Management Units | Maximum
Equity-Indexed Compensation Plans
Annualized distribution level required for units to become earned (in dollars per unit)	$ 2.40
AAP | AAP Management Units
Equity-Indexed Compensation Plans
Equivalent distribution entitled to be received when earned		94.10%			94.10%
AAP | PAA
Equity-Indexed Compensation Plans
Units To Be Issued		0.941			0.941
Conversion of AAP Management Units into AAP Units
Equity-Indexed Compensation Plans
Ratio for conversion or exchange of units		0.941			0.941
Conversion of AAP Management Units into AAP Units | AAP
Equity-Indexed Compensation Plans
Ratio for conversion or exchange of units		0.941			0.941