Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Nov. 30, 2024	Dec. 31, 2023
Short-term debt:
Short-term debt	$ 408		$ 446
Long-term debt:
PAA senior notes, net of unamortized discounts and debt issuance costs	7,141		7,242
Noncurrent portion of other long-term debt	72		63
Total long-term debt	7,213		7,305
Total debt	7,621		7,751
PAA Senior Notes
Long-term debt:
Unamortized discounts and debt issuance costs	(42)		(41)
PAA senior notes, net of unamortized discounts and debt issuance costs	7,141		7,242
Debt instrument face value	7,200		7,300
PAA Senior Notes | Level 2
Long-term debt:
Debt instrument fair value	$ 6,700		$ 6,900
PAA Senior Notes | 3.60% senior notes due November 2024
Short-term debt:
Debt instrument, interest rate (as a percent)	3.60%	3.60%	3.60%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 0		$ 750
PAA Senior Notes | 4.65% senior notes due October 2025
Short-term debt:
Debt instrument, interest rate (as a percent)	4.65%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 1,000		1,000
PAA Senior Notes | 4.50% senior notes due December 2026
Short-term debt:
Debt instrument, interest rate (as a percent)	4.50%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 750		750
PAA Senior Notes | 3.55% senior notes due December 2029
Short-term debt:
Debt instrument, interest rate (as a percent)	3.55%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 1,000		1,000
PAA Senior Notes | 3.80% senior notes due September 2030
Short-term debt:
Debt instrument, interest rate (as a percent)	3.80%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 750		750
PAA Senior Notes | 5.70% senior notes due September 2034
Short-term debt:
Debt instrument, interest rate (as a percent)	5.70%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 650
Debt instrument face value	$ 650
PAA Senior Notes | 6.70% senior notes due May 2036
Short-term debt:
Debt instrument, interest rate (as a percent)	6.70%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 250		250
PAA Senior Notes | 6.65% senior notes due January 2037
Short-term debt:
Debt instrument, interest rate (as a percent)	6.65%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 600		600
PAA Senior Notes | 5.15% senior notes due June 2042
Short-term debt:
Debt instrument, interest rate (as a percent)	5.15%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 499		499
PAA Senior Notes | 4.30% senior notes due January 2043
Short-term debt:
Debt instrument, interest rate (as a percent)	4.30%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 348		348
PAA Senior Notes | 4.70% senior notes due June 2044
Short-term debt:
Debt instrument, interest rate (as a percent)	4.70%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 687		687
PAA Senior Notes | 4.90% senior notes due February 2045
Short-term debt:
Debt instrument, interest rate (as a percent)	4.90%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 649		649
Other long-term debt
Long-term debt:
Noncurrent portion of other long-term debt	72		63
Line of Credit | PAA Commercial Paper Notes
Short-term debt:
Short-term notes and borrowings	$ 393		$ 433
Weighted average interest rate, short-term (as a percent)	4.60%		5.80%
Other
Short-term debt:
Short-term debt	$ 15		$ 13