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Investments Summary of Significant Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summarized Financial Information for Significant Equity Investments [Line Items] |  |  |
Percent of investee information represented | 100.00% |  |
Revenues | $ 4,703 | $ 4,084 | $ 3,857
Costs and expenses | 3,398 | 3,056 | 3,408
Net income | 1,305 | 1,028 | $ 449
Current assets | 956 | 892 |
Non-current assets | 22,344 | 22,170 |
Current liabilities | 1,241 | 3,532 |
Non-current liabilities | 10,605 | 9,187 |
Partners’/owners’ equity | $ 11,454 | $ 10,343 |

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