Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Goodwill and Other Intangible Assets
Aggregate pre-tax amortization expense	$ 106	$ 106
Continuing Operations [Member]
Goodwill and Other Intangible Assets
Aggregate pre-tax amortization expense	106	99
Pre-tax amortization expense, 2013	196
Pre-tax amortization expense, 2014	333
Pre-tax amortization expense, 2015	346
Pre-tax amortization expense, 2016	302
Pre-tax amortization expense, 2017	173
Pre-tax amortization expense, 2018	$ 168