Restructuring and Other Costs (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period			$ 17
Accruals/provisions	53	14	110	14
Payments/ write-offs			(96)
Balance, end of period	31		31
Severance Benefit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period			12
Accruals/provisions			76
Payments/ write-offs			(67)
Balance, end of period	21		21
Professional Fees [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period			0
Accruals/provisions			28
Payments/ write-offs			(19)
Balance, end of period	9		9
Asset Impairment Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period			0
Accruals/provisions			5
Payments/ write-offs			(5)
Balance, end of period	0		0
Other Contract Termination Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period			5
Accruals/provisions			1
Payments/ write-offs			(5)
Balance, end of period	$ 1		$ 1