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Commitments and Contingencies - Litigation and Regulatory Matters (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 25, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Loss Contingencies [Line Items]          
Litigation settlement expense   $ 352,000,000 $ 90,000,000 $ 539,000,000 $ 292,000,000
Minimum          
Loss Contingencies [Line Items]          
Estimated range of possible loss   0   0  
Maximum          
Loss Contingencies [Line Items]          
Estimated range of possible loss   $ 1,800,000,000   $ 1,800,000,000  
Precious Metals Trading          
Loss Contingencies [Line Items]          
Settlement payment $ 36,500,000