Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Tax benefit included in discontinued operations		$ 1	$ 3	$ 55
Tax benefit realized from exercise of employee stock options		6	2
Unamortized tax-deductible goodwill resulting from intercompany stock sales and reorganizations		179
Minimum unamortized tax-deduction rate on goodwill		30.00%
Maximum unamortized tax-deduction rate on goodwill		34.00%
Income tax benefit for operational losses related to certain foreign jurisdictions that are excluded from the estimated annual effective tax rate calculation		8,300		250
Percentage of temporary tax differences that reverse within the carryforward period		25.00%
Percentage of temporary tax differences that reverse within tax planning strategies		5.00%
Percentage of deferred tax asset exclusive of reversing temporary differences		70.00%
Percentage of the effect of unrecognized tax benefit, if recorded		2.00%	4.00%	1.00%
Interest and penalties recognized		2	1	6
Income related to accrued interest and penalties		2	4	1
Noncash charge related to elimination of a deferred tax asset			79
Amount accrued for payment of interest and penalties	12	12	13
Holiday period, years	10
Measurement Of Net Deferred Tax Asset And Noncash Charge To Earnings	60
Decrease to the net deferred tax asset and noncash charge to earnings	$ 90