Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions |
|
3 Months Ended |
12 Months Ended |
Oct. 03, 2016 |
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 |
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
$ 6,115
|
$ 6,628
|
$ 5,643
|
$ 6,135
|
$ 5,799
|
$ 6,482
|
$ 5,555
|
$ 5,729
|
$ 24,521
|
$ 23,565
|
$ 22,743
|
Interest expense |
|
|
|
|
|
|
|
|
|
2,094
|
1,986
|
1,916
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
4,074
|
3,527
|
3,294
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
83
|
119
|
(15)
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
448
|
1,196
|
1,156
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
2,647
|
3,065
|
2,571
|
Add back noncontrolling interests component |
|
|
|
|
|
|
|
|
|
(22)
|
5
|
7
|
Income (Loss) From Discontinued Operations, net of tax |
|
20
|
4
|
(5)
|
|
(2)
|
(2)
|
(2)
|
|
19
|
(6)
|
(408)
|
Net income (loss) |
|
454
|
1,066
|
502
|
622
|
703
|
955
|
689
|
717
|
2,644
|
3,064
|
2,170
|
Net Income (Loss) Attributable to Parent |
|
464
|
1,082
|
500
|
620
|
703
|
954
|
686
|
716
|
2,666
|
3,059
|
2,152
|
Tax Act |
|
|
|
|
|
|
|
|
|
20
|
(112)
|
|
After-tax severance charges |
|
187
|
|
|
|
|
|
|
|
187
|
15
|
118
|
After-tax loss on sale and retirement |
|
|
|
|
(107)
|
|
|
|
|
(107)
|
|
|
Asset Impairment Charges |
|
|
|
|
|
|
|
|
|
402
|
282
|
18
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
9,668
|
8,198
|
13,215
|
Segment assets |
|
145,392
|
|
|
|
137,914
|
|
|
|
145,392
|
137,914
|
132,761
|
Duke Energy Ohio [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
505
|
469
|
459
|
524
|
497
|
471
|
437
|
518
|
1,957
|
1,923
|
1,944
|
Interest expense |
|
|
|
|
|
|
|
|
|
92
|
91
|
86
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
268
|
261
|
233
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
43
|
59
|
78
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
176
|
193
|
192
|
Income (Loss) From Discontinued Operations, net of tax |
|
|
|
|
|
|
(1)
|
|
|
|
(1)
|
36
|
Net Income (Loss) Attributable to Parent |
|
55
|
$ 100
|
46
|
(25)
|
65
|
55
|
$ 30
|
$ 42
|
176
|
192
|
228
|
Tax Act |
|
2
|
|
|
|
(23)
|
|
|
|
2
|
(23)
|
|
After-tax severance charges |
|
6
|
|
|
|
|
|
|
|
6
|
|
3
|
After-tax loss on sale and retirement |
|
|
|
|
107
|
|
|
|
|
107
|
|
|
Asset Impairment Charges |
|
|
|
|
|
|
|
|
|
|
1
|
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
827
|
686
|
476
|
Segment assets |
|
8,555
|
|
|
|
7,875
|
|
|
|
8,555
|
7,875
|
7,528
|
Piedmont Natural Gas [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Net Income (Loss) Attributable to Parent |
|
|
|
|
|
|
|
|
|
|
|
20
|
Asset Impairment Charges |
|
|
|
|
|
|
|
|
|
|
7
|
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Payments to Acquire Businesses, Gross |
$ 5,000
|
|
|
|
|
|
|
|
|
|
|
|
International Energy [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Income (Loss) From Discontinued Operations, net of tax |
|
|
|
|
|
|
|
|
|
|
|
(534)
|
Asset Impairment Charges |
|
|
|
|
|
|
|
|
|
|
|
194
|
Regulatory settlements [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Regulatory settlement charges |
|
|
|
$ 179
|
$ 86
|
23
|
$ 135
|
|
|
265
|
158
|
|
Electric Utilities and Infrastructure [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
22,242
|
21,300
|
21,336
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
6
|
5
|
5
|
Tax Act |
|
|
|
|
|
|
|
|
|
24
|
231
|
|
Electric Utilities and Infrastructure [Member] | Regulatory settlements [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Regulatory settlement charges |
|
|
|
|
|
|
|
|
|
202
|
98
|
|
Electric Utilities and Infrastructure [Member] | After-tax impairment charge [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Asset Impairment Charges, net of tax |
|
|
|
|
|
|
|
|
|
46
|
|
|
Gas Utilities and Infrastructure [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
1,783
|
1,743
|
875
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
27
|
62
|
19
|
Tax Act |
|
|
|
|
|
|
|
|
|
1
|
26
|
|
Gas Utilities and Infrastructure [Member] | Piedmont Natural Gas [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Payments to Acquire Businesses, Gross |
$ 5,000
|
|
|
|
|
|
|
|
|
|
|
|
Gas Utilities and Infrastructure [Member] | After-tax impairment charge [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Asset Impairment Charges, net of tax |
|
|
|
|
|
|
|
|
|
42
|
|
|
Commercial Renewables [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
477
|
460
|
484
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
(1)
|
(5)
|
(82)
|
Tax Act |
|
|
|
|
|
|
|
|
|
3
|
442
|
|
Asset Impairment Charges, net of tax |
|
|
|
|
|
|
|
|
|
91
|
74
|
|
Asset Impairment Charges |
|
|
|
|
|
|
|
|
|
|
|
71
|
Other Segments [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
19
|
62
|
48
|
Tax Act |
|
|
|
|
|
|
|
|
|
2
|
597
|
|
After-tax severance charges |
|
|
|
|
|
|
|
|
|
144
|
|
|
After-tax loss on sale and retirement |
|
|
|
|
|
|
|
|
|
82
|
|
|
Costs to achieve mergers, acquisition costs |
|
|
|
|
|
|
|
|
|
65
|
64
|
329
|
Cost Savings Initiative, Net of tax |
|
|
|
|
|
|
|
|
|
|
|
57
|
Other Segments [Member] | International Energy [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
|
|
26
|
Total Reportable Segments [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
24,502
|
23,503
|
22,695
|
Operating Segments [Member] | Electric Utilities and Infrastructure [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
22,273
|
21,331
|
21,366
|
Interest expense |
|
|
|
|
|
|
|
|
|
1,288
|
1,240
|
1,136
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
3,523
|
3,010
|
2,897
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
5
|
5
|
5
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
799
|
1,355
|
1,672
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
3,058
|
3,210
|
3,040
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
8,086
|
7,024
|
6,649
|
Segment assets |
|
125,364
|
|
|
|
119,423
|
|
|
|
125,364
|
119,423
|
114,993
|
Operating Segments [Member] | Electric Utilities and Infrastructure [Member] | Duke Energy Ohio [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
1,450
|
1,373
|
1,410
|
Interest expense |
|
|
|
|
|
|
|
|
|
67
|
62
|
58
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
183
|
178
|
151
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
47
|
40
|
55
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
186
|
138
|
154
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
655
|
491
|
322
|
Segment assets |
|
5,643
|
|
|
|
5,066
|
|
|
|
5,643
|
5,066
|
4,782
|
Operating Segments [Member] | Gas Utilities and Infrastructure [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
1,881
|
1,836
|
901
|
Interest expense |
|
|
|
|
|
|
|
|
|
106
|
105
|
46
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
245
|
231
|
115
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
27
|
62
|
19
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
78
|
116
|
90
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
274
|
319
|
152
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
1,133
|
907
|
5,519
|
Segment assets |
|
12,361
|
|
|
|
11,462
|
|
|
|
12,361
|
11,462
|
10,760
|
Operating Segments [Member] | Gas Utilities and Infrastructure [Member] | Duke Energy Ohio [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
506
|
508
|
503
|
Interest expense |
|
|
|
|
|
|
|
|
|
24
|
28
|
27
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
85
|
83
|
80
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
24
|
39
|
44
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
93
|
85
|
77
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
172
|
195
|
154
|
Segment assets |
|
2,874
|
|
|
|
2,758
|
|
|
|
2,874
|
2,758
|
2,696
|
Operating Segments [Member] | Commercial Renewables [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
477
|
460
|
484
|
Interest expense |
|
|
|
|
|
|
|
|
|
88
|
87
|
53
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
155
|
155
|
130
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
(1)
|
(5)
|
(82)
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
(147)
|
(628)
|
(160)
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
9
|
441
|
23
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
193
|
92
|
857
|
Segment assets |
|
4,204
|
|
|
|
4,156
|
|
|
|
4,204
|
4,156
|
4,377
|
Operating Segments [Member] | Total Reportable Segments [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
24,631
|
23,627
|
22,751
|
Interest expense |
|
|
|
|
|
|
|
|
|
1,482
|
1,432
|
1,235
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
3,923
|
3,396
|
3,142
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
31
|
62
|
(58)
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
730
|
843
|
1,602
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
3,341
|
3,970
|
3,215
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
9,412
|
8,023
|
13,025
|
Segment assets |
|
141,929
|
|
|
|
135,041
|
|
|
|
141,929
|
135,041
|
130,130
|
Operating Segments [Member] | Total Reportable Segments [Member] | Duke Energy Ohio [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
1,956
|
1,881
|
1,913
|
Interest expense |
|
|
|
|
|
|
|
|
|
91
|
90
|
85
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
268
|
261
|
231
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
71
|
79
|
99
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
279
|
223
|
231
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
827
|
686
|
476
|
Segment assets |
|
8,517
|
|
|
|
7,824
|
|
|
|
8,517
|
7,824
|
7,478
|
Intersegment Eliminations [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
(199)
|
(200)
|
(125)
|
Interest expense |
|
|
|
|
|
|
|
|
|
(45)
|
(20)
|
(12)
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
(1)
|
|
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
|
|
1
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment assets |
|
188
|
|
|
|
188
|
|
|
|
188
|
188
|
188
|
Intersegment Eliminations [Member] | Duke Energy Ohio [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment assets |
|
|
|
|
|
(15)
|
|
|
|
|
(15)
|
(12)
|
Intersegment Eliminations [Member] | Electric Utilities and Infrastructure [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
31
|
31
|
30
|
Intersegment Eliminations [Member] | Gas Utilities and Infrastructure [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
98
|
93
|
26
|
Intersegment Eliminations [Member] | Other Segments [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
70
|
76
|
69
|
Intersegment Eliminations [Member] | Total Reportable Segments [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
129
|
124
|
56
|
Corporate, Non-Segment [Member] | Other Segments [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
89
|
138
|
117
|
Interest expense |
|
|
|
|
|
|
|
|
|
657
|
574
|
693
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
152
|
131
|
152
|
Equity in earnings (losses) of unconsolidated affiliates |
|
|
|
|
|
|
|
|
|
52
|
57
|
43
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
(282)
|
353
|
(446)
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
(694)
|
(905)
|
(645)
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Capital investments, expenditures and acquisitions |
|
|
|
|
|
|
|
|
|
256
|
175
|
190
|
Segment assets |
|
3,275
|
|
|
|
2,685
|
|
|
|
3,275
|
2,685
|
2,443
|
Corporate, Non-Segment [Member] | Other Segments [Member] | Duke Energy Ohio [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Revenues |
|
|
|
|
|
|
|
|
|
1
|
42
|
31
|
Interest expense |
|
|
|
|
|
|
|
|
|
1
|
1
|
1
|
Depreciation and amortization |
|
|
|
|
|
|
|
|
|
|
|
2
|
Income tax expense (benefit) from continuing operations |
|
|
|
|
|
|
|
|
|
(28)
|
(20)
|
(21)
|
Segment income (loss) |
|
|
|
|
|
|
|
|
|
(103)
|
(30)
|
(39)
|
Segment Reporting Information Assets [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment assets |
|
$ 38
|
|
|
|
$ 66
|
|
|
|
38
|
66
|
62
|
Noncontrolling Interest [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Net income (loss) |
|
|
|
|
|
|
|
|
|
(22)
|
$ 5
|
$ 18
|
Noncontrolling Interest [Member] | Commercial Renewables [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information, Profit (Loss) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
Asset Impairment Charges, net of tax |
|
|
|
|
|
|
|
|
|
$ 2
|
|
|