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Supplemental Cash Flow Disclosures (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Jun. 30, 2013 USD ($)
Supplemental cash flow disclosures |  |  |  |
Interest paid | $ 113 | $ 81 | $ 55 |
Income taxes paid, net of refunds received | (11) | 59 | 33 |
Letters of credit outstanding | 2 |  |  |
Other assets and deferred charges | 405 | 172 |  |
Supplemental cash flows, stock based compensation |  |  |  |
Cash receipts upon exercise of stock options | 12 | 7 | 5 |
Cash disbursements for payments of taxes | (6) | (5) | (4) |
Net cash receipts from exercise of stock options and vesting of other stock awards | $ 6 | $ 2 | $ 1 |
Auction 901 Mobility Funds |  |  |  |
Supplemental cash flow disclosures |  |  |  |
FCC auction date | Sep. 27, 2012 |  |  |
FCC auction amount received | $ 35 |  |  |
FCC auction number of states won | 10 |  |  |
Letters of credit outstanding | $ 2 |  |  | $ 17
Other assets and deferred charges | 2 |  |  |
Maximum | Auction 901 Mobility Funds |  |  |  |
Supplemental cash flow disclosures |  |  |  |
FCC auction amount | 300 |  |  |
FCC auction amount awarded | $ 40 |  |  |
Common Shares |  |  |  |
Supplemental cash flows, stock based compensation |  |  |  |
Shares withheld | shares | 308,010 | 228,011 | 163,355 |
Aggregate value of shares withheld | $ 13 | $ 8 | $ 7 |

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