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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Combinations [Abstract] |  |  |  |
Revenue | $ 3,967 | $ 3,940 | $ 12,830 | $ 12,842
Net income attributable to the Company | $ 306 | $ 181 | $ 1,445 | $ 804
Basic net income per share attributable to the Company (in dollars per share) | $ 0.61 | $ 0.36 | $ 2.85 | $ 1.59
Diluted net income per share attributable to the Company (in dollars per share) | $ 0.60 | $ 0.36 | $ 2.83 | $ 1.57

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