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Retrospective Application of Change in Accounting Policy (Tables) | 12 Months Ended
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Dec. 31, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |
Retrospective Application of Change in Accounting Policy | The following tables provide information regarding the impact of these revisions on selected consolidated financial data:
|  | 2016 |  | 2015 |  | 2014
Year Ended December 31, 2016 | As previously reported1 |  | As adjusted |  | As previously reported1 |  | As adjusted |  | As previously reported1 |  | As adjusted
(Dollars in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Service | $ | 3,030 |  | $ | 3,081 |  | $ | 3,350 |  |  | 3,384 |  |  | 3,398 |  |  | 3,407
| Total operating revenues |  | 3,939 |  |  | 3,990 |  |  | 3,997 |  |  | 4,031 |  |  | 3,893 |  |  | 3,902
Operating income (loss) |  | (3) |  |  | 48 |  |  | 313 |  |  | 347 |  |  | (143) |  |  | (134)
Investment and other income (expenses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest and dividend income |  | 57 |  |  | 6 |  |  | 36 |  |  | 2 |  |  | 12 |  |  | 3
| Total investment and other income |  | 85 |  |  | 34 |  |  | 91 |  |  | 57 |  |  | 84 |  |  | 75
1 | In Annual Report on Form 10-K for the year ended December 31, 2016, filed on February 24, 2017.

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