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Investments Investments (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investment in limited partnerships
Equity in earnings of limited partnerships	$ 161	$ 131	$ 149
Indemnity
Investment in limited partnerships
Equity in earnings of limited partnerships	22	15	26
Indemnity \| Equity method of accounting
Investment in limited partnerships
Equity in earnings of limited partnerships	21	13	26
Indemnity \| Fair value option
Investment in limited partnerships
Equity in earnings of limited partnerships	1	2	0
Exchange
Investment in limited partnerships
Equity in earnings of limited partnerships	139	116	123
Exchange \| Equity method of accounting
Investment in limited partnerships
Equity in earnings of limited partnerships	128	105	107
Exchange \| Fair value option
Investment in limited partnerships
Equity in earnings of limited partnerships	$ 11	$ 11	$ 16

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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