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Fair Value of Financial Instruments (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets at Fair Value
Financial investments, at fair value	$ 268	$ 235
Fair Value, Measurements, Recurring
Assets at Fair Value
Financial investments, at fair value	268	235
Default fund and margin deposit investments	1,649	2,129
Total Assets at Fair Value	1,917	2,364
Liabilities at Fair Value
Other financial instruments	112
Total Liabilities at Fair Value	112
Fair Value, Measurements, Recurring | Level 1
Assets at Fair Value
Financial investments, at fair value	133	135
Default fund and margin deposit investments	327	371
Total Assets at Fair Value	460	506
Liabilities at Fair Value
Other financial instruments	0
Total Liabilities at Fair Value	0
Fair Value, Measurements, Recurring | Level 2
Assets at Fair Value
Financial investments, at fair value	135	100
Default fund and margin deposit investments	1,322	1,758
Total Assets at Fair Value	1,457	1,858
Liabilities at Fair Value
Other financial instruments	112
Total Liabilities at Fair Value	112
Fair Value, Measurements, Recurring | Level 3
Assets at Fair Value
Financial investments, at fair value	0	0
Default fund and margin deposit investments	0	0
Total Assets at Fair Value	0	$ 0
Liabilities at Fair Value
Other financial instruments	0
Total Liabilities at Fair Value	$ 0

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Clearing member cash contribution invested in highly rated government debt securities.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Amount of investment in marketable security, classified as current.

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