Debt - Components (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Short-term debt:
Total short-term debt	$ 1,159	$ 822
Long-term debt:
PAA senior notes, net of unamortized discounts and debt issuance costs	7,237	8,329
Noncurrent portion of other long-term debt	50	69
Total long-term debt	7,287	8,398
Total debt	8,446	9,220
PAA senior notes
Long-term debt:
Unamortized discounts and debt issuance costs	(46)	(54)
PAA senior notes, net of unamortized discounts and debt issuance costs	7,237	8,329
Debt instrument face value	8,400	9,100
PAA senior notes | Level 2
Long-term debt:
Debt instrument fair value	$ 7,600	$ 9,900
PAA senior notes | 3.65% senior notes due June 2022
Short-term debt:
Debt instrument, interest rate (as a percent)	3.65%
PAA senior notes | 2.85% senior notes due January 2023
Short-term debt:
Debt instrument, interest rate (as a percent)		2.85%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 0	$ 400
PAA senior notes | 3.85% senior notes due October 2023
Short-term debt:
Debt instrument, interest rate (as a percent)		3.85%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 0	$ 700
PAA senior notes | 3.60% senior notes due November 2024
Short-term debt:
Debt instrument, interest rate (as a percent)	3.60%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 750	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%		3.80%
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 750	750
Debt instrument face value			$ 750
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	50	69
PAA senior notes | 3.65% senior notes due June 2022
Short-term debt:
Short-term notes and borrowings	0	$ 750
Debt instrument, interest rate (as a percent)		3.65%
PAA senior notes | 2.85% senior notes due January 2023
Short-term debt:
Short-term notes and borrowings	$ 400	$ 0
Debt instrument, interest rate (as a percent)	2.85%
PAA senior notes | 3.85% senior notes due October 2023
Short-term debt:
Short-term notes and borrowings	$ 700	0
Debt instrument, interest rate (as a percent)	3.85%
Other
Short-term debt:
Total short-term debt	$ 59	$ 72