Restructuring and Other Items (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 3	$ 206	$ 154	$ 342
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	3	7	83	15
Facilities and Fleet [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	0	146	71	182
Merger Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 0	$ 53	$ 0	$ 145