Pensions, Other Post-employment Benefits and Employee Benefit Plans Net Periodic Benefit Cost (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits
Net Periodic Benefit Cost [Line Items]
Service cost	$ 16	$ 30	$ 29
Interest cost	69	77	83
Expected return on plan assets	(70)	(62)	(67)
Amortization of actuarial losses	27	39	26
Amortization of prior service credit	0	1	0
Settlement loss (gain)	1	(1)	0
Curtailment gain	0	(1)	0
Net periodic benefit cost	43	83	71
Other Post-Employment Benefits
Net Periodic Benefit Cost [Line Items]
Service cost	0	1	1
Interest cost	11	14	18
Expected return on plan assets	0	0	0
Amortization of actuarial losses	6	2	1
Amortization of prior service credit	(9)	(14)	(16)
Settlement loss (gain)	0	0	0
Curtailment gain	(40)	(51)	(1)
Net periodic benefit cost	$ (32)	$ (48)	$ 3