Presented in the table below are the changes in contract assets and liabilities for the year ended December 31, 2019: | | | | | | Amount | Contract assets: | | Balance at January 1, 2019 | $ | 14 |
| Additions | 27 |
| Transfers to accounts receivable, net | (28 | ) | Balance at December 31, 2019 | $ | 13 |
| | | Contract liabilities: | | Balance at January 1, 2019 | $ | 20 |
| Additions | 62 |
| Transfers to operating revenues | (55 | ) | Balance at December 31, 2019 | $ | 27 |
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Presented in the table below are operating revenues disaggregated for the year ended December 31, 2019: | | | | | | | | | | | | |
| Revenues from Contracts with Customers | | Other Revenues Not from Contracts with Customers (a) | | Total Operating Revenues | Regulated Businesses: | | | | | | Water services: | | | | | | Residential | $ | 1,734 |
| | $ | 1 |
| | $ | 1,735 |
| Commercial | 639 |
| | — |
| | 639 |
| Fire service | 142 |
| | — |
| | 142 |
| Industrial | 138 |
| | — |
| | 138 |
| Public and other | 214 |
| | — |
| | 214 |
| Total water services | 2,867 |
| | 1 |
| | 2,868 |
| Wastewater services: | |
| | | | | Residential | 119 |
| | — |
| | 119 |
| Commercial | 31 |
| | — |
| | 31 |
| Industrial | 3 |
| | — |
| | 3 |
| Public and other | 14 |
| | — |
| | 14 |
| Total wastewater services | 167 |
| | — |
| | 167 |
| Miscellaneous utility charges | 36 |
| | — |
| | 36 |
| Alternative revenue programs | — |
| | 16 |
| | 16 |
| Lease contract revenue | — |
| | 7 |
| | 7 |
| Total Regulated Businesses | 3,070 |
| | 24 |
| | 3,094 |
| Market-Based Businesses | 539 |
| | — |
| | 539 |
| Other | (22 | ) | | (1 | ) | | (23 | ) | Total operating revenues | $ | 3,587 |
| | $ | 23 |
| | $ | 3,610 |
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(a) Includes revenues associated with provisional rates, alternative revenue programs, lease contracts and intercompany rent, which are outside the scope of ASC 606 and accounted for under other existing GAAP.
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