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Segment and Significant Customer Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues $ 2,354 $ 2,890 $ 2,259 $ 2,009 $ 1,801 $ 2,586 $ 2,084 $ 2,281 $ 9,512 [1] $ 8,752 [1] $ 6,716 [1]
Commodity Margin                 3,033 2,708 2,604
Mark-to-Market Commodity Activity, Net and Other Revenue [2]                 (270) (294) (75)
Operating and maintenance expense                 1,020 1,080 977
Depreciation and amortization expense                 739 724 662
General and other administrative expense                 158 155 140
Other Cost and Expense, Operating                 98 85 79
Impairment losses                 10 41 13
(Gain) on sale of assets, net                 0 (27) (157)
(Income) from unconsolidated subsidiaries                 24 22 24
Income from operations $ 105 $ 568 $ 417 $ (328) $ (100) $ 393 $ 13 $ 72 762 378 839
Interest expense, net of interest income                 617 621 631
Debt Extinguishment Costs and Other (Income) Expense, Net                 53 70 49
Income before income taxes                 92 (313) 159
Lease levelization                 0 (8) (2)
Contract amortization                 $ 100 $ 175 $ 218
Number of significant customers                 0 0 0
West [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues [1]                 $ 1,988 $ 1,881 $ 1,545
Commodity Margin                 1,060 970 984
Mark-to-Market Commodity Activity, Net and Other Revenue [2]                 (165) (19) (11)
Operating and maintenance expense                 348 361 355
Depreciation and amortization expense                 269 240 224
General and other administrative expense                 40 45 38
Other Cost and Expense, Operating                 42 38 33
Impairment losses                 0 28 13
(Gain) on sale of assets, net                   0 0
(Income) from unconsolidated subsidiaries                 0 0 0
Income from operations                 196 239 310
Texas [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues [1]                 2,860 2,342 2,145
Commodity Margin                 646 552 543
Mark-to-Market Commodity Activity, Net and Other Revenue [2]                 (197) (174) 12
Operating and maintenance expense                 272 308 298
Depreciation and amortization expense                 237 208 205
General and other administrative expense                 61 66 56
Other Cost and Expense, Operating                 24 14 8
Impairment losses                 0 13 0
(Gain) on sale of assets, net                   0 0
(Income) from unconsolidated subsidiaries                 0 0 0
Income from operations                 (145) (231) (12)
East [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues [1]                 1,987 1,658 1,657
Commodity Margin                 970 790 905
Mark-to-Market Commodity Activity, Net and Other Revenue [2]                 40 (62) 15
Operating and maintenance expense                 269 302 312
Depreciation and amortization expense                 180 201 214
General and other administrative expense                 38 27 40
Other Cost and Expense, Operating                 32 33 38
Impairment losses                 10 0 0
(Gain) on sale of assets, net                   (27) (157)
(Income) from unconsolidated subsidiaries                 26 24 24
Income from operations                 507 216 497
Consolidation, Eliminations [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues [1]                 (1,299) (926) (151)
Commodity Margin                 0 0 0
Mark-to-Market Commodity Activity, Net and Other Revenue                 (32) [2] (29) (29)
Operating and maintenance expense                 (32) (29) (29)
Depreciation and amortization expense                 0 0 0
General and other administrative expense                 0 0 0
Other Cost and Expense, Operating                 0 0 0
Impairment losses                 0 0 0
(Gain) on sale of assets, net                   0 0
(Income) from unconsolidated subsidiaries                 0 0 0
Income from operations                 0 0 0
Retail [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues [1]                 3,976 3,797 1,520
Commodity Margin                 357 396 172
Mark-to-Market Commodity Activity, Net and Other Revenue                 84 [2] (10) (62)
Operating and maintenance expense                 163 138 41
Depreciation and amortization expense                 53 75 19
General and other administrative expense                 19 17 6
Other Cost and Expense, Operating                 0 0 0
Impairment losses                 0 0 0
(Gain) on sale of assets, net                   0 0
(Income) from unconsolidated subsidiaries                 (2) (2) 0
Income from operations                 204 154 44
Intersegment Eliminations [Member] | West [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues                 488 324 20
Intersegment Eliminations [Member] | Texas [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues                 573 361 81
Intersegment Eliminations [Member] | East [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues                 234 237 48
Intersegment Eliminations [Member] | Retail [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenues                 4 4 2
Other Assets [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Contract amortization                 $ 104 $ 178 $ 122
[1] Includes intersegment revenues of $488 million, $324 million and $20 million in the West, $573 million, $361 million and $81 million in Texas, $234 million, $237 million and $48 million in the East and $4 million, $4 million, $2 million in Retail for the years ended December 31, 2018, 2017 and 2016, respectively.
[2] Includes nil, $(8) million and $(2) million of lease levelization and $104 million, $178 million and $122 million of amortization expense for the years ended December 31, 2018, 2017 and 2016, respectively.