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Acquisitions and Dispositions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Business Combination and Asset Acquisition [Abstract] |  |  |  |
Revenue | $ 5,017 | $ 4,231 | $ 10,137 | $ 8,970
Net income attributable to the Company | $ 820 | $ 577 | $ 1,806 | $ 1,332
Basic net income per share attributable to the Company (in dollars per share) | $ 1.61 | $ 1.14 | $ 3.55 | $ 2.64
Diluted net income per share attributable to the Company (in dollars per share) | $ 1.60 | $ 1.13 | $ 3.52 | $ 2.61

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