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Investments Investments (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Investments in limited partnerships
Equity in earnings of limited partnerships	$ 27	$ 39	$ 77	$ 75
Indemnity
Investments in limited partnerships
Equity in earnings of limited partnerships	3	5	9	8
Indemnity \| Equity method of accounting
Investments in limited partnerships
Equity in earnings of limited partnerships	2	5	7	7
Indemnity \| Fair value option
Investments in limited partnerships
Equity in earnings of limited partnerships	1	0	2	1
Exchange
Investments in limited partnerships
Equity in earnings of limited partnerships	24	34	68	67
Exchange \| Equity method of accounting
Investments in limited partnerships
Equity in earnings of limited partnerships	18	31	57	60
Exchange \| Fair value option
Investments in limited partnerships
Equity in earnings of limited partnerships	$ 6	$ 3	$ 11	$ 7

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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