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

[1] Includes contingent consideration obligations related to acquisitions.

[2] Includes contingent consideration obligations related to acquisitions.