Other Intangible Assets Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired	$ 26	$ 5
Amortization expense	$ 88	$ 108	$ 120