Employee Benefits - Amounts Recognized in Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current liabilities	$ (132)	$ (78)
Pension Plans
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current assets	41	0
Current liabilities	(1)	(1)
Non-current liabilities	(67)	(77)
Net asset (liability) at December 31	(27)	(78)
Health Care and Life
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current assets	0	0
Current liabilities	(1)	0
Non-current liabilities	(14)	0
Net asset (liability) at December 31	$ (15)	$ 0