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Accounts Receivable (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Accounts receivable |  |  |  |  |
Accounts receivable, gross, current |  |  |  | $ 735,000,000 | $ 778,000,000
Other |  |  |  | 4,000,000 | 9,000,000
Total accounts receivable, gross, current |  |  |  | 735,000,000 | 778,000,000
Accounts receivable, allowance (in dollars) | $ (38,000,000) | $ (43,000,000) | $ (46,000,000) | (47,000,000) | (38,000,000)
Accounts receivable, less allowance |  |  |  | 688,000,000 | 740,000,000
Customer receivable in excess of 10% of accounts receivable |  |  |  | 0 |
Changes in allowance for doubtful accounts |  |  |  |  |
Beginning balance | 38,000,000 | 43,000,000 | 46,000,000 |  |
Provision for uncollectible accounts | 78,000,000 | 64,000,000 | 65,000,000 |  |
Deductions | (69,000,000) | (69,000,000) | (68,000,000) |  |
Ending balance | $ 47,000,000 | $ 38,000,000 | $ 43,000,000 |  |
Unbilled revenues |  |  |  |  |
Accounts receivable |  |  |  |  |
Accounts receivable, gross, current |  |  |  | 111,000,000 | 120,000,000
Total accounts receivable, gross, current |  |  |  | 111,000,000 | 120,000,000
Trade accounts receivable |  |  |  |  |
Accounts receivable |  |  |  |  |
Accounts receivable, gross, current |  |  |  | 620,000,000 | 649,000,000
Total accounts receivable, gross, current |  |  |  | $ 620,000,000 | $ 649,000,000

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