Leases (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Year 1 Operating	$ 45
Year 2 Operating	42
Year 3 Operating	34
Year 4 Operating	22
Year 5 Operating	20
Later years, Operating Leases	48
Sublease rentals	(4)
Operating Leases, Future Minimum Payments Due	207
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Year 1 Capital	1
Year 2 Capital	1
Year 3 Capital	1
Year 4 Capital	1
Year 5 Capital	1
Later years, Capital Leases	23
Capital Leases, Future Minimum Sublease Rentals	0
Capital Leases, Future Minimum Payments Due	28
Less imputed interest costs	(18)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	10
Operating Leases, Rent Expense, Net [Abstract]
Operating Leases, Rent Expense	$ 106	$ 103	$ 70