Contingencies, Commitments and Guarantees (Contingencies - Narrative) (Details) - USD ($)	Nov. 19, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 80,000,000
Minimum
Loss Contingencies
Loss Contingency, Range of Possible Loss, Portion Not Accrued		$ 0
Maximum
Loss Contingencies
Loss Contingency, Range of Possible Loss, Portion Not Accrued		$ 250,000,000