Retirement Plans and Other Retiree Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer			$ 100	$ 100
United States Pension Benefits [Member]
Components of net periodic benefit cost
Service Cost	7	7	14	14
Interest cost	23	24	46	49
ESOP Offset	0	0	0	0
Expected return on plan assets	(30)	(28)	(59)	(56)
Amortization of transition and prior service costs (credits)	3	3	5	5
Amortization of actuarial loss	16	14	32	29
Net periodic benefit cost	19	20	38	41
International Pension Benefits [Member]
Components of net periodic benefit cost
Service Cost	4	6	10	11
Interest cost	7	8	14	17
ESOP Offset	0	0	0	0
Expected return on plan assets	(6)	(6)	(12)	(12)
Amortization of transition and prior service costs (credits)	0	0	0	0
Amortization of actuarial loss	4	3	7	5
Net periodic benefit cost	9	11	19	21
Other Retiree Benefits [Member]
Components of net periodic benefit cost
Service Cost	3	3	7	6
Interest cost	10	10	20	21
ESOP Offset	(1)	(1)	(1)	(1)
Expected return on plan assets	0	0	(1)	(1)
Amortization of transition and prior service costs (credits)	0	1	0	2
Amortization of actuarial loss	6	4	11	8
Net periodic benefit cost	$ 18	$ 17	$ 36	$ 35