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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 237 $ 185
Reconciliation of net income to net cash provided by operating activities:    
Depreciation and amortization 60 63
Equity compensation expense 39 20
Gain on sales of linefill and base gas (12) (13)
Net cash received/(paid) for terminated interest rate or foreign currency hedging instruments (23) 12
Other (4) 3
Changes in assets and liabilities, net of acquisitions 20 384
Net cash provided by operating activities 317 654
CASH FLOWS FROM INVESTING ACTIVITIES    
Cash paid in connection with acquisitions, net of cash acquired (21) (756)
Change in restricted cash (1,632) 18
Additions to property and equipment (263) (121)
Proceeds from sales of assets 13  
Net cash received for sales and purchases of linefill and base gas 13 19
Other investing activities   (2)
Net cash used in investing activities (1,890) (842)
CASH FLOWS FROM FINANCING ACTIVITIES    
Net borrowings/(repayments) on PAA's revolving credit facility 184 (654)
Net repayments on PAA's hedged inventory facility (75) (200)
Net repayments on PNG's credit agreements (5) (52)
Proceeds from the issuance of senior notes 1,247 597
Repayments of senior notes   (200)
Net proceeds from the issuance of common units (Note 9) 455 503
Cash received for sale of noncontrolling interest in a subsidiary   370
Distributions paid to common unitholders (Note 9) (159) (135)
Distributions paid to general partner (Note 9) (66) (49)
Distributions to noncontrolling interests (12) (5)
Other financing activities (9) (4)
Net cash provided by financing activities 1,560 171
Effect of translation adjustment on cash 1  
Net decrease in cash and cash equivalents (12) (17)
Cash and cash equivalents, beginning of period 26 36
Cash and cash equivalents, end of period 14 19
Cash paid for interest, net of amounts capitalized 78 71
Cash paid for income taxes, net of amounts refunded $ 28