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Financial Instruments and Fair Value Measures - Short-Term Borrowings (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Short-Term Borrowings        
Short-term borrowings   $ 64   $ 0
Repayments of other short-term borrowings   0 $ 3,000  
Commercial paper        
Short-Term Borrowings        
Short-term borrowings   $ 0   $ 0
Weighted-average interest rate on commercial paper (as a percent)   1.80% 2.70%  
Term loan facilities | May 2018 term loan credit agreement        
Short-Term Borrowings        
Repayments of other short-term borrowings $ 3,000      
Term loan credit agreement term 364 days