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Summary of Significant Accounting Policies (Change in Presentation of Cash and Cash Equivalents Held Within Default Funds and Margin Deposits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 1,706	$ 1,083	$ 1,252
Net cash used in investing activities	49	(2,653)	(122)
Net cash provided by financing activities	1,036	1,418	1,910
Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents	(1,293)	(331)	353
Net increase in cash, cash equivalents, restricted cash and cash equivalents	1,498	(483)	3,393
Cash and cash equivalents, restricted cash and cash equivalents at beginning of period	5,496	5,979	2,586
Cash and cash equivalents, restricted cash and cash equivalents at end of period	6,994	5,496	5,979
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents
Cash and cash equivalents	502	393	2,745
Restricted cash and cash equivalents	22	29	37
Restricted cash and cash equivalents (Default funds and margin deposits)	7,021	5,911
Total	$ 6,994	5,496	5,979
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)			3,197
As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities			1,252
Net cash used in investing activities			(231)
Net cash provided by financing activities			1,383
Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents			16
Net increase in cash, cash equivalents, restricted cash and cash equivalents			2,420
Cash and cash equivalents, restricted cash and cash equivalents at beginning of period		2,782	362
Cash and cash equivalents, restricted cash and cash equivalents at end of period			2,782
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents
Cash and cash equivalents			2,745
Restricted cash and cash equivalents			37
Total			2,782
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			109
Net cash provided by financing activities			527
Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents			337
Net increase in cash, cash equivalents, restricted cash and cash equivalents			973
Cash and cash equivalents, restricted cash and cash equivalents at beginning of period		$ 3,197	2,224
Cash and cash equivalents, restricted cash and cash equivalents at end of period			3,197
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents
Cash and cash equivalents			0
Restricted cash and cash equivalents			0
Total			3,197
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)			$ 3,197

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