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Stockholder's Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity Note [Abstract] |
Schedule of cash dividends declared | We declared the following cash dividend to QSC:
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
| (Dollars in millions)
Cash dividend declared to QSC | $ | 1,350 |  |  | 1,400 |  |  | 1,325 |
Cash dividend paid to QSC | 1,350 |  |  | 1,400 |  |  | 1,325 |

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