Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Other Intangible Assets [Line Items]
Goodwill impairment	$ 0	$ 0
Aggregate pre-tax amortization expense	362	363	$ 323
Continuing Operations [Member]
Goodwill and Other Intangible Assets [Line Items]
Aggregate pre-tax amortization expense	360	$ 360	$ 317
Pre-tax amortization expense, 2016	329
Pre-tax amortization expense, 2017	205
Pre-tax amortization expense, 2018	207
Pre-tax amortization expense, 2019	200
Pre-tax amortization expense, 2020	$ 177