Restructuring and Other Items (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring and other items	$ 144	$ 82	$ 151	$ 136
Facilities and Fleet [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other items	64	36	71	36
Merger Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other items	0	46	0	92
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other items	$ 80	$ 0	$ 80	$ 8