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Significant Accounting Policies (Schedule Of Securities Segregated For Regulatory Purposes) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable Securities [Line Items] |  |  |
Securities - segregated for regulatory purposes |  | $ 30,709 | $ 15,121
US And Foreign Government Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Securities - segregated for regulatory purposes |  | 7,348 | 4,729
Municipal Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Securities - segregated for regulatory purposes |  | 15 |
Securities Purchased Under Agreement To Resell [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Securities - segregated for regulatory purposes | [1] | $ 23,346 | $ 10,392
[1] | These balances are collateralized by U.S. government securities.

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