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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 1,127 $ 994 $ 514
Reconciliation of net income to net cash provided by operating activities:      
Depreciation and amortization 482 249 256
Equity compensation expense 101 110 98
Inventory valuation adjustments 128 4 3
Gain on sales of linefill and base gas (19) (21) (21)
Net cash received/(paid) for terminated interest rate and foreign currency hedging instruments (112) 12  
Other (1) 15 14
Changes in assets and liabilities, net of acquisitions:      
Trade accounts receivable and other 218 83 (59)
Inventory (180) 518 (336)
Accounts payable and other current liabilities (504) 401 (210)
Net cash provided by operating activities 1,240 2,365 259
CASH FLOWS FROM INVESTING ACTIVITIES      
Cash paid in connection with acquisitions, net of cash acquired (Note 3) (2,156) (1,390) (407)
Change in restricted cash   20 (20)
Additions to property, equipment and other (1,204) (635) (451)
Net cash received/(paid) for sales and purchases of linefill and base gas (44) (22) 25
Investment in unconsolidated entities (76)    
Cash received upon formation of equity-method investment 59    
Proceeds from sales of assets 22 12 3
Other investing activities 7 (5) (1)
Net cash used in investing activities (3,392) (2,020) (851)
CASH FLOWS FROM FINANCING ACTIVITIES      
Net borrowings/(repayments) on PAA's revolving credit facility 59 (793) 49
Net borrowings/(repayments) on PAA's hedged inventory facility 591 (425) 200
Net borrowings on PNG's credit agreements 61 62 260
Proceeds from the issuance of senior notes 1,996 597 400
Repayments of senior notes (500) (200) (175)
Net proceeds from the issuance of common units (Note 10) 979 889 296
Cash received for sale of noncontrolling interest in a subsidiary   370 268
Distributions paid to common unitholders (Note 10) (684) (575) (512)
Distributions paid to general partner (Note 10) (285) (216) (170)
Distributions paid to noncontrolling interests (48) (40) (10)
Other financing activities (18) (14) (2)
Net cash provided by/(used in) financing activities 2,151 (345) 604
Effect of translation adjustment on cash (1) (10) (1)
Net increase/(decrease) in cash and cash equivalents (2) (10) 11
Cash and cash equivalents, beginning of period 26 36 25
Cash and cash equivalents, end of period 24 26 36
Cash paid for:      
Interest, net of amounts capitalized 295 254 253
Income taxes, net of amounts refunded $ 71 $ 11 $ 21