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Contingencies and Commitments (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Loss Contingencies [Line Items]  
Charges during period $ 82
Payments during period 163
Minimum  
Loss Contingencies [Line Items]  
Estimate of possible loss 415
Maximum  
Loss Contingencies [Line Items]  
Estimate of possible loss $ 550