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Acquisitions and Dispositions (Pro-Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combinations [Abstract] |  |  |
Revenue | $ 17,301 | $ 17,323 | $ 17,106
Net income attributable to the Company | $ 2,021 | $ 1,877 | $ 1,302
Basic net income per share attributable to the Company (in dollars per share) | $ 3.99 | $ 3.71 | $ 2.58
Diluted net income per share attributable to the Company (in dollars per share) | $ 3.95 | $ 3.67 | $ 2.55

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