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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
REVENUES    
Supply and Logistics segment revenues $ 8,111 $ 6,395
Transportation segment revenues 146 138
Facilities segment revenues 141 134
Total revenues 8,398 6,667
COSTS AND EXPENSES    
Purchases and related costs 7,519 5,593
Field operating costs 292 288
General and administrative expenses 79 74
Depreciation and amortization 127 121
Total costs and expenses 8,017 6,076
OPERATING INCOME 381 591
OTHER INCOME/(EXPENSE)    
Equity earnings in unconsolidated entities 75 53
Interest expense (net of capitalized interest of $6 and $6, respectively) (106) (129)
Other expense, net (1) (5)
INCOME BEFORE TAX 349 510
Current income tax expense (13) (10)
Deferred income tax expense (48) (56)
NET INCOME 288 444
NET INCOME PER COMMON UNIT (NOTE 4):    
Net income allocated to common unitholders — Basic 237 406
Net income allocated to common unitholders — Diluted $ 237 $ 443
Common Units    
NET INCOME PER COMMON UNIT (NOTE 4):    
Basic weighted average common units outstanding (units) 725 691
Basic net income per common unit (usd per unit) $ 0.33 $ 0.59
Diluted weighted average common units outstanding (units) 727 758
Diluted net income per common unit (usd per unit) $ 0.33 $ 0.58