Goodwill and Other Intangible Assets (Amortization Expense on Existing Intangible Assets) (Details) - Other Intangible Assets [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 114	$ 128	$ 243
Future amortization expense to be recognized during 2016	97
Future amortization expense to be recognized during 2017	83
Future amortization expense to be recognized during 2018	72
Future amortization expense to be recognized during 2019	61
Future amortization expense to be recognized during 2020	$ 37