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Investments Summary of Significant Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Revenues | $ 11,700 | $ 13,209 | $ 14,144
Costs and Expenses | 10,140 | 8,336 | 10,350
Net Income | 180 | 2,239 | 1,919
Current assets | 3,203 | 3,238 |
Current liabilities | 5,074 | 5,100 |
Non-current liabilities | 34,333 | 34,168 |
Partners’/owners’ equity | 31,436 | 33,742 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenues | 5,076 | 4,906 | 4,898
Costs and Expenses | 4,249 | 3,508 | 3,245
Net Income | 827 | 1,398 | $ 1,653
Current assets | 1,013 | 1,195 |
Non-current assets | 25,069 | 24,743 |
Current liabilities | 1,787 | 2,125 |
Non-current liabilities | 9,734 | 9,670 |
Partners’/owners’ equity | $ 14,561 | $ 14,143 |

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