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Acquisitions and Dispositions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract] |  |  |  |
Revenue | $ 4,587 | $ 4,019 | $ 14,730 | $ 12,955
Net income attributable to the Company | $ 538 | $ 322 | $ 2,345 | $ 1,655
Basic net income per share attributable to the Company (in dollars per share) | $ 1.06 | $ 0.63 | $ 4.62 | $ 3.27
Diluted net income per share attributable to the Company (in dollars per share) | $ 1.05 | $ 0.63 | $ 4.57 | $ 3.24

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