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Operating Segments - Reconciliation of Segment Adjusted EBITDA (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting, Reconciling Item from Segments to Consolidated [Line Items]    
Segment adjusted EBITDA $ 592 $ 512
Adjustments:    
Depreciation and amortization of unconsolidated entities (14) (14)
Gains from derivative activities net of inventory valuation adjustments 23 289
Long-term inventory costing adjustments 13 (7)
Deficiencies under minimum volume commitments, net (10) (11)
Equity-indexed compensation expense (11) (3)
Net gain/(loss) on foreign currency revaluation (10) 4
Significant acquisition-related expenses   (5)
Unallocated general and administrative expenses (80) (75)
Depreciation and amortization (127) (122)
Interest expense, net (106) (129)
Other expense, net (1) (5)
INCOME BEFORE TAX 348 508
Income tax expense (75) (106)
NET INCOME 273 402
Net income attributable to noncontrolling interests (236) (361)
NET INCOME ATTRIBUTABLE TO PAGP 37 41
Unallocated    
Adjustments:    
Unallocated general and administrative expenses $ (1) $ (1)