The following table provides the changes in contract assets and liabilities for the year ended December 31, 2018: | | | | | | Amount | Contract assets: | | Balance at January 1, 2018 | $ | 35 |
| Additions | 18 |
| Transfers to accounts receivable, net | (39 | ) | Balance at December 31, 2018 | $ | 14 |
| | | Contract liabilities: | | Balance at January 1, 2018 | $ | 25 |
| Additions | 52 |
| Transfers to operating revenues | (57 | ) | Balance at December 31, 2018 | $ | 20 |
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The following table provides operating revenues disaggregated for the year ended December 31, 2018: | | | | | | | | | | | | |
| Revenues from Contracts with Customers | | Other Revenues Not from Contracts with Customers (a) | | Total Operating Revenues | Regulated Businesses: | | | | | | Water services: | | | | | | Residential | $ | 1,663 |
| | $ | — |
| | $ | 1,663 |
| Commercial | 616 |
| | — |
| | 616 |
| Fire service | 137 |
| | — |
| | 137 |
| Industrial | 136 |
| | — |
| | 136 |
| Public and other | 197 |
| | — |
| | 197 |
| Total water services | 2,749 |
| | — |
| | 2,749 |
| Wastewater services: | |
| | | | | Residential | 115 |
| | — |
| | 115 |
| Commercial | 30 |
| | — |
| | 30 |
| Industrial | 2 |
| | — |
| | 2 |
| Public and other | 14 |
| | — |
| | 14 |
| Total wastewater services | 161 |
| | — |
| | 161 |
| Miscellaneous utility charges | 48 |
| | — |
| | 48 |
| Alternative revenue programs | — |
| | 19 |
| | 19 |
| Lease contract revenue | — |
| | 7 |
| | 7 |
| Total Regulated Businesses | 2,958 |
| | 26 |
| | 2,984 |
| Market-Based Businesses | 476 |
| | — |
| | 476 |
| Other | (17 | ) | | (3 | ) | | (20 | ) | Total operating revenues | $ | 3,417 |
| | $ | 23 |
| | $ | 3,440 |
|
| | (a) | Includes revenues associated with 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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