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Acquisitions, Investments and Dispositions - Pro Forma Supplemental Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 13, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Combinations [Abstract] |  |  |  |
Revenues |  | $ 12,574 | $ 12,337 | $ 12,033
Net income |  | 1,343 | 1,382 | 1,525
If Acquired January 1, 2017 (a)(b) |  |  |  |
Revenue |  |  | 12,655 | 12,331
Net income |  |  | 1,279 | $ 1,612
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Interest expense |  | 37 | 38 |
Business acquisition, pre-tax gain from interests in projects | $ 131 |  | 131 |
Pro Forma |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Income from equity method investment |  | 33 | $ 32 |
Term Loan |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Short-term borrowings |  | $ 825 |  |
Fixed interest rate |  | 4.64% |  |

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