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Fair Value of Financial Investments (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments	$ 2
Private Equity Funds [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments	2
Quoted Market Prices (Level 1) [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments
Quoted Market Prices (Level 1) [Member] \| Private Equity Funds [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments
Significant Other Observable Inputs (Level 2) [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments
Significant Other Observable Inputs (Level 2) [Member] \| Private Equity Funds [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments
Significant Unobservable Inputs (Level 3) [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments	2
Significant Unobservable Inputs (Level 3) [Member] \| Private Equity Funds [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments	2
Gains (Losses) [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments	(2)
Gains (Losses) [Member] \| Private Equity Funds [Member]
Non-Recurring Fair Value Measurements
Fair value on a non-recurring basis of financial investments	$ (2)