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Taxes - Income before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Taxes      
U.S. operations $ (315) $ 627 $ 560
Non-U.S. operations 10,481 10,715 10,840
Income from continuing operations before income taxes $ 10,166 $ 11,342 $ 11,400