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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Combinations [Abstract] |  |  |  |
Revenue | $ 4,189 | $ 4,395 | $ 8,891 | $ 8,963
Net income attributable to the Company | $ 574 | $ 488 | $ 1,328 | $ 1,146
Basic net income per share attributable to the Company (in dollars per share) | $ 1.13 | $ 0.96 | $ 2.63 | $ 2.26
Diluted net income per share attributable to the Company (in dollars per share) | $ 1.12 | $ 0.95 | $ 2.60 | $ 2.24

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