Fair Value Election and Measurement Level 3 Significant Unobservable Input Assumptions (Additional Information) (Details) - USD ($) $ in Millions	Sep. 30, 2015		Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Other Liabilities, Fair Value Disclosure	$ 23	[1]	$ 27	[2]

[1] Includes contingent consideration obligations related to acquisitions.

[2] Includes contingent consideration obligations related to acquisitions.