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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, 2021
Feb. 09, 2021
Dec. 31, 2020
Sep. 30, 2020
Short-term Debt [Line Items]        
Long-term Debt Payable within one year $ 1   $ 1 $ 1
Finance Lease, Liability, Current 1   1 1
Short-term borrowings and finance lease obligations 1,372   3 2,142
Commercial Paper [Member]        
Short-term Debt [Line Items]        
Short-term borrowings 802   0 926
Securities Sold under Agreements to Repurchase [Member]        
Short-term Debt [Line Items]        
Short-term borrowings   $ 1,000    
Other loans - various currencies [Member]        
Short-term Debt [Line Items]        
Short-term borrowings 18   1 39
Repurchase Agreements [Member] | Securities Sold under Agreements to Repurchase [Member]        
Short-term Debt [Line Items]        
Short-term borrowings $ 550   $ 0 $ 1,175