Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 75	$ 27	$ 22
Amortization expense of intangible assets next 12 months	106
Finite-Lived Intangible Assets, Amortization Expense, Year Two	99
Finite-Lived Intangible Assets, Amortization Expense, Year Three	95
Finite-Lived Intangible Assets, Amortization Expense, Year Four	93
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 89