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Investments Investments (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment in limited partnerships
Equity in earnings of limited partnerships	$ 113	$ 161	$ 131
Indemnity
Investment in limited partnerships
Equity in earnings of limited partnerships	11	22	15
Indemnity \| Equity method of accounting
Investment in limited partnerships
Equity in earnings of limited partnerships	9	21	13
Indemnity \| Fair value option
Investment in limited partnerships
Equity in earnings of limited partnerships	2	1	2
Exchange
Investment in limited partnerships
Equity in earnings of limited partnerships	102	139	116
Exchange \| Equity method of accounting
Investment in limited partnerships
Equity in earnings of limited partnerships	88	128	105
Exchange \| Fair value option
Investment in limited partnerships
Equity in earnings of limited partnerships	$ 14	$ 11	$ 11

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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