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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
Sep. 30, 2020
Feb. 29, 2020
Dec. 31, 2019
Sep. 30, 2019
Short-term Debt [Line Items]        
Long-term Debt Payable within one year $ 1   $ 1 $ 4
Finance Lease, Liability, Current 1   4 4
Short-term borrowings and finance lease obligations $ 2,142   $ 7 $ 3,604
Short-term Debt, Weighted Average Interest Rate, at Point in Time 0.90%   6.70% 2.60%
Commercial Paper [Member]        
Short-term Debt [Line Items]        
Short-term borrowings $ 926   $ 0 $ 2,432
Other loans - various currencies [Member]        
Short-term Debt [Line Items]        
Short-term borrowings 39   2 35
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 $ 1,175   $ 0 $ 1,129