Revenue Recognition - Disaggregated Revenues (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
$ 1,074
|
|
$ 2,817
|
|
| Other operating income |
5
|
|
37
|
|
| Operating revenues |
1,079
|
$ 1,013
|
2,854
|
$ 2,708
|
| Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
(5)
|
|
(12)
|
|
| Other operating income |
0
|
|
(1)
|
|
| Operating revenues |
(5)
|
|
(13)
|
|
| Regulated Businesses |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
940
|
|
2,430
|
|
| Other operating income |
5
|
|
38
|
|
| Alternative revenue programs |
2
|
|
30
|
|
| Lease contract revenue |
3
|
|
8
|
|
| Operating revenues |
945
|
|
2,468
|
|
| Regulated Businesses | Water Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
882
|
|
2,265
|
|
| Other operating income |
0
|
|
0
|
|
| Operating revenues |
882
|
|
2,265
|
|
| Regulated Businesses | Wastewater Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
48
|
|
137
|
|
| Operating revenues |
48
|
|
137
|
|
| Regulated Businesses | Miscellaneous Utility Charge |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
10
|
|
28
|
|
| Operating revenues |
10
|
|
28
|
|
| Market-Based Businesses |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
139
|
|
399
|
|
| Operating revenues |
139
|
|
399
|
|
| Residential | Regulated Businesses | Water Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
562
|
|
1,435
|
|
| Other operating income |
0
|
|
0
|
|
| Operating revenues |
562
|
|
1,435
|
|
| Residential | Regulated Businesses | Wastewater Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
35
|
|
99
|
|
| Operating revenues |
35
|
|
99
|
|
| Commercial | Regulated Businesses | Water Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
187
|
|
471
|
|
| Operating revenues |
187
|
|
471
|
|
| Commercial | Regulated Businesses | Wastewater Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
8
|
|
25
|
|
| Operating revenues |
8
|
|
25
|
|
| Fire service | Regulated Businesses | Water Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
37
|
|
110
|
|
| Operating revenues |
37
|
|
110
|
|
| Industrial | Regulated Businesses | Water Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
38
|
|
101
|
|
| Operating revenues |
38
|
|
101
|
|
| Industrial | Regulated Businesses | Wastewater Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
1
|
|
2
|
|
| Operating revenues |
1
|
|
2
|
|
| Public and other | Regulated Businesses | Water Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
58
|
|
148
|
|
| Operating revenues |
58
|
|
148
|
|
| Public and other | Regulated Businesses | Wastewater Services |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue from contract |
4
|
|
11
|
|
| Operating revenues |
$ 4
|
|
$ 11
|
|