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Financing Arrangements - Revolving credit agreement (Details) - USD ($)
$ in Millions
3 Months Ended 15 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Dec. 31, 2021
Long-term debt        
Payments on debt $ 123 $ 36    
Proceeds from borrowings $ 147 $ 46    
Commercial paper        
Long-term debt        
Average amount of commercial paper outstanding     $ 353  
Weighted average interest rate (as a percent)     0.38%  
Weighted average maturity 14 days   27 days  
Short-term borrowings $ 428   $ 428 $ 250
Weighted average interest rate of outstanding balance (as a percent) 0.99%   0.99% 0.35%
Weighted average maturity of outstanding balance 40 days      
Revolving credit agreement        
Long-term debt        
Maximum aggregate principal amount       $ 1,000