Postretirement Benefits (Details 3) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Employee pension plan
Postretirement Benefits
Expected employer contribution during next fiscal year			$ 15
Funded status at end of period	(95)	(201)
Pension liability recorded in the Consolidated Statement of Financial Position:
Pension liabilities - due within one year	(1)	(2)
Pension liabilities - due after one year	(94)	(199)
Net amount recognized	$ (95)	$ (201)