Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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-Name Staff Accounting Bulletin (SAB)

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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Principles of Consolidation and Other Matters Investment Income (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013 Trident II [Member]	Mar. 31, 2013 Trident II [Member] Performance Fees [Member]	Jun. 30, 2014 Trident III [Member] Performance Fees [Member]	Jun. 30, 2014 Private Equity Funds [Member] Trident III [Member]	Jun. 30, 2014 Private Equity Funds [Member] Trident III [Member]
Deferred Revenue Arrangement [Line Items]
Equity method income	$ 20
Recognized deferred performance fees		15	7
Unrealized Gain (Loss) on Investments				2	3
Deferred performance fees			$ 37