Retirement Plans and Other Retiree Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
United States Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Voluntary benefit plan contribution			$ 0	$ 2
Components of net periodic benefit cost
Service Cost	$ 0	$ 0	1	1
Interest cost	25	25	75	76
ESOP Offset	0	0	0	0
Expected return on plan assets	(29)	(28)	(87)	(84)
Amortization of transition and prior service costs (credits)	0	0	0	0
Amortization of actuarial loss (gain)	12	11	36	27
Net periodic benefit cost	8	8	25	20
International Pension Benefits [Member]
Components of net periodic benefit cost
Service Cost	4	5	14	15
Interest cost	6	8	21	26
ESOP Offset	0	0	0	0
Expected return on plan assets	(6)	(7)	(20)	(22)
Amortization of transition and prior service costs (credits)	1	0	2	3
Amortization of actuarial loss (gain)	3	2	8	3
Net periodic benefit cost	8	8	25	25
Other Retiree Benefits [Member]
Components of net periodic benefit cost
Service Cost	5	2	13	8
Interest cost	11	11	34	32
ESOP Offset	0	0	(1)	(1)
Expected return on plan assets	(1)	(1)	(2)	(2)
Amortization of transition and prior service costs (credits)	0	0	0	0
Amortization of actuarial loss (gain)	6	4	20	12
Net periodic benefit cost	$ 21	$ 16	$ 64	$ 49