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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Short-term borrowings and finance lease obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Feb. 29, 2020
Dec. 31, 2019
Jun. 30, 2019
Short-term Debt [Line Items]        
Long-term Debt Payable within one year $ 1   $ 1 $ 2
Finance Lease, Liability, Current 2   4 18
Short-term borrowings and finance lease obligations $ 1,529   $ 7 $ 2,058
Short-term Debt, Weighted Average Interest Rate, at Point in Time 1.00%   6.70% 3.10%
Commercial Paper [Member]        
Short-term Debt [Line Items]        
Short-term borrowings $ 671   $ 0 $ 1,107
Other loans - various currencies [Member]        
Short-term Debt [Line Items]        
Short-term borrowings 55   2 154
Repurchase Agreements [Member]        
Short-term Debt [Line Items]        
Short-term borrowings   $ 1,300    
Repurchase Agreements [Member] | Securities Sold under Agreements to Repurchase [Member]        
Short-term Debt [Line Items]        
Short-term borrowings $ 800   $ 0 $ 777