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Operating Segments (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Reconciliation of segment profit to net income attributable to Plains |  |
Segment profit | $ 380 | $ 348
Depreciation and amortization | (60) | (63)
Interest expense | (65) | (65)
Other income/(expense), net | 2 | (22)
Income tax expense | (20) | (13)
NET INCOME | 237 | 185
Net income attributable to noncontrolling interests | (7) | (3)
NET INCOME ATTRIBUTABLE TO PLAINS | $ 230 | $ 182

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