Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Intangible Assets
Aggregate pre-tax amortization expense	$ 51	$ 122
Continuing Operations [Member]
Other Intangible Assets
Aggregate pre-tax amortization expense	51	$ 122
Pre-tax amortization expense, 2017	151
Pre-tax amortization expense, 2018	209
Pre-tax amortization expense, 2019	211
Pre-tax amortization expense, 2020	193
Pre-tax amortization expense, 2021	138
Pre-tax amortization expense, 2022	$ 115