Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Other Intangible Assets [Line Items]
Goodwill impairment	$ 0	$ 0
Aggregate pre-tax amortization expense	337	277	176
Continuing Operations [Member]
Goodwill and Other Intangible Assets [Line Items]
Aggregate pre-tax amortization expense	312	253	155
Pre-tax amortization expense, 2013	302
Pre-tax amortization expense, 2014	333
Pre-tax amortization expense, 2015	345
Pre-tax amortization expense, 2016	301
Pre-tax amortization expense, 2017	$ 173