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Financing Arrangements - Term Loan (Details) - USD ($)
$ in Millions
Apr. 12, 2019
Dec. 31, 2019
Apr. 11, 2019
Dec. 31, 2018
Term loan credit agreement due April 25, 2019        
Long-term debt        
Long-term debt excluding fair value adjustments     $ 165 $ 165
Term loan credit agreement due April 12, 2021        
Long-term debt        
Term of the credit agreement 24 years      
Long-term debt excluding fair value adjustments $ 500 $ 405