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Debt (Tables) | 6 Months Ended
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Jun. 30, 2017
Debt Disclosure [Abstract] |
Components of Debt | The following table summarizes the major components of debt at each balance sheet date (in millions) and provides the maturities and interest rate ranges of each major category as of June 30, 2017:
|  | June 30, 2017 |  |  | December 31, 2016 |
$2.25 billion revolving credit facility, maturing July 2020 (weighted average interest rate of 1.9% as of December 31, 2016) |  | $ | — |  |  | $ | 426 |
Commercial paper program (weighted average interest rate of 1.4% as of June 30, 2017) |  |  | 253 |  |  |  | — |
Other letter of credit facilities, maturing through December 2018 |  |  | — |  |  |  | — |
Canadian term loan and revolving credit facility, maturing March 2019 (weighted average effective interest rate of 2.0% as of June 30, 2017 and 2.1% as of December 31, 2016) |  |  | 171 |  |  |  | 239 |
Senior notes maturing through 2045, interest rates ranging from 2.4% to 7.75% (weighted average interest rate of 4.6% as of June 30, 2017 and December 31, 2016) |  |  | 6,033 |  |  |  | 6,033 |
Tax-exempt bonds, maturing through 2045, fixed and variable interest rates ranging from 0.9% to 5.7% (weighted average interest rate of 1.9% as of June 30, 2017 and 1.8% as of December 31, 2016) |  |  | 2,305 |  |  |  | 2,304 |
Capital leases and other, maturing through 2055, interest rates up to 12% |  |  | 295 |  |  |  | 308 |
|  |  | 9,057 |  |  |  | 9,310 |
Current portion of long-term debt |  |  | 390 |  |  |  | 417 |
|  | $ | 8,667 |  |  | $ | 8,893 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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