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Income Taxes (Schedule of Earnings before Income Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                      
United States                 $ 509 $ 499 $ 542
International                 1,847 1,564 1,379
Earnings before income taxes $ 657 $ 534 $ 623 $ 542 $ 649 $ 471 $ 444 $ 499 $ 2,356 $ 2,063 $ 1,921