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Investments Investments (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Investments in limited partnerships
Equity in earnings of limited partnerships	$ 50	$ 36
Indemnity
Investments in limited partnerships
Equity in earnings of limited partnerships	6	3
Indemnity \| Equity method of accounting
Investments in limited partnerships
Equity in earnings of limited partnerships	5	2
Indemnity \| Fair value option
Investments in limited partnerships
Equity in earnings of limited partnerships	1	1
Exchange
Investments in limited partnerships
Equity in earnings of limited partnerships	44	33
Exchange \| Equity method of accounting
Investments in limited partnerships
Equity in earnings of limited partnerships	39	29
Exchange \| Fair value option
Investments in limited partnerships
Equity in earnings of limited partnerships	$ 5	$ 4

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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