Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Variable Interest Entity [Line Items]
Assets	$ 2,946		$ 2,946		$ 2,888
Liabilities	2,625		2,625		2,567
Weighted average common shares adjustment related to stock-based compensation	1.9	1.9	2.0	1.8
Anti-dilutive potential common shares related to stock-based compensation plans	1.2	1.0	1.0	1.3
Maturities of short term investments			3 months
New collateralized loan obligation temporary warehousing entities [Member]
Variable Interest Entity [Line Items]
Assets	153		153
Liabilities	$ 124		$ 124