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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, 2021
Feb. 09, 2021
Dec. 31, 2020
Jun. 30, 2020
Short-term Debt [Line Items]        
Long-term Debt Payable within one year $ 1   $ 1 $ 1
Finance Lease, Liability, Current 1   1 2
Short-term borrowings and finance lease obligations 677   3 1,529
Commercial Paper [Member]        
Short-term Debt [Line Items]        
Short-term borrowings 494   0 671
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 31   1 55
Repurchase Agreements [Member] | Securities Sold under Agreements to Repurchase [Member]        
Short-term Debt [Line Items]        
Short-term borrowings $ 150   $ 0 $ 800