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Contingencies - Other Matters (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
Mar. 31, 2021
Contingencies        
Loss contingency accrual   $ 11 $ 11 $ 20
Loss contingency payment   3    
Loss contingency accrual decrease   $ (6)    
Gain from favorable court ruling $ 69   $ 69  
Income tax expense related to litigation settlement $ 28