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Contingencies, Commitments and Guarantees (Guarantees - Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 118  
Guarantor Obligations, Current Carrying Value 1 $ 1
Minimum    
Loss Contingencies [Line Items]    
Indemnities And Guarantees Contractual Limitation Range 1  
Minimum | Non-litigation loss    
Loss Contingencies [Line Items]    
Aggregate reasonably possible losses in excess of amounts accrued for loss contingency matters as to which an estimate can be made 0  
Maximum    
Loss Contingencies [Line Items]    
Indemnities And Guarantees Contractual Limitation Range 112  
Aggregate reasonably possible losses in excess of amounts accrued for loss contingency matters as to which an estimate can be made 10  
Maximum | Non-litigation loss    
Loss Contingencies [Line Items]    
Aggregate reasonably possible losses in excess of amounts accrued for loss contingency matters as to which an estimate can be made $ 250