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Other Income (Expense), Net - Footnote (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Qualified Plan        
Employee Retirement Plans        
Settlement loss $ 406 $ 0 $ 406 $ 0