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Basis of Presentation and Principles of Consolidation (Change in Presentation of Cash and Cash Equivalents Held Within Default Funds and Margin Deposits) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net cash provided by operating activities $ 605 $ 394  
Net cash used in investing activities (390) (2,700)  
Net cash provided by (used in) financing activities 368 164  
Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents (164) (177)  
Net increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents 419 (2,319)  
Cash and cash equivalents, restricted cash and cash equivalents at beginning of period 5,496 5,979  
Cash and cash equivalents, restricted cash and cash equivalents at end of period 5,915 3,660  
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents      
Cash and cash equivalents 486 774 $ 393
Restricted cash and cash equivalents 31 38 29
Restricted cash and cash equivalents (Default funds and margin deposits) 6,570   5,911
Total $ 5,915 3,660 $ 5,496
Default Funds and Margin Deposits      
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents      
Restricted cash and cash equivalents (Default funds and margin deposits)   2,848  
As Reported      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net cash provided by operating activities   394  
Net cash used in investing activities   (2,505)  
Net cash provided by (used in) financing activities   152  
Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents   (11)  
Net increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents   (1,970)  
Cash and cash equivalents, restricted cash and cash equivalents at beginning of period   2,782  
Cash and cash equivalents, restricted cash and cash equivalents at end of period   812  
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents      
Cash and cash equivalents   774  
Restricted cash and cash equivalents   38  
Total   812  
As Reported | Default Funds and Margin Deposits      
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents      
Restricted cash and cash equivalents (Default funds and margin deposits)   0  
Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net cash provided by operating activities   0  
Net cash used in investing activities   (195)  
Net cash provided by (used in) financing activities   12  
Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents   (166)  
Net increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents   (349)  
Cash and cash equivalents, restricted cash and cash equivalents at beginning of period   3,197  
Cash and cash equivalents, restricted cash and cash equivalents at end of period   2,848  
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents      
Cash and cash equivalents   0  
Restricted cash and cash equivalents   0  
Total   2,848  
Adjustment | Default Funds and Margin Deposits      
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents      
Restricted cash and cash equivalents (Default funds and margin deposits)   $ 2,848