Growth and Value Plan & Discontinued Operations (Income/Loss from Discontinued Ops) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue									$ 2,062	$ 2,382	$ 2,529
Expenses									2,287	2,035	2,135
Operating (loss) profit									(225)	347	394
Disposal Group, Including Discontinued Operation, Interest Expense									(2)	(3)	(2)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									(223)	350	396
Provision for taxes on (loss) income									11	116	144
(Loss) income from discontinued operations before gain on sale									(234)	234	252
Gain from discontinued operations, net of taxes of $48									0	74	0
(Loss) income from discontinued operations, net of tax	$ (404)	$ 165	$ 40	$ (36)	$ 108	$ 207	$ 34	$ (41)	$ (234)	$ 308	$ 252