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Employee Benefit Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension Plan        
Defined Contribution Plan Disclosure [Line Items]        
Defined contribution plans $ 5 $ 0 $ 10 $ 1