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Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Interest $ 414 $ 405
Income taxes 1,572 1,307
Net Purchases of Short-Term Investments    
Short-term investments purchased (982) (831)
Short-term investments sold 497 2,088
Net sale (purchases) of short-term investments $ (485) $ 1,257