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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] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | The following table provides information regarding the impact of this retrospective application of change in accounting policy on selected consolidated financial data:
|  | 2016 |  | 2015 |  | 2014
Year Ended December 31, 2016 | As previously reported 1 |  | As adjusted |  | As previously reported 1 |  | As adjusted |  | As previously reported 1 |  | As adjusted
(Dollars in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Service | $ | 3,999 |  | $ | 4,050 |  | $ | 4,322 |  |  | 4,356 |  |  | 4,329 |  |  | 4,338
| Total operating revenues |  | 5,104 |  |  | 5,155 |  |  | 5,176 |  |  | 5,210 |  |  | 5,009 |  |  | 5,018
Operating income (loss) |  | 60 |  |  | 111 |  |  | 397 |  |  | 431 |  |  | (190) |  |  | (181)
Investment and other income (expenses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest and dividend income |  | 62 |  |  | 11 |  |  | 39 |  |  | 5 |  |  | 17 |  |  | 8
| Total investment and other income |  | 32 |  |  | (19) |  |  | 38 |  |  | 4 |  |  | 38 |  |  | 29
1 | In Annual Report on Form 10-K for the year ended December 31, 2016, filed on February 24, 2017.

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