Commitments and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Long-term Purchase Commitment [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 57
Operating Leases, Future Minimum Payments, Due in Two Years	48
Operating Leases, Future Minimum Payments, Due in Three Years	39
Operating Leases, Future Minimum Payments, Due in Four Years	29
Operating Leases, Future Minimum Payments, Due in Five Years	27
Operating Leases, Future Minimum Payments, Due Thereafter	107
Operating Leases, Future Minimum Payments Due	307
Operating Leases, Rent Expense	112	92	140
Increase In Rent Expense Related To Right Of Way Liabilities			$ 70
Minimum [Member]
Long-term Purchase Commitment [Line Items]
Operating lease term, low range	1 year
Maximum [Member]
Long-term Purchase Commitment [Line Items]
Operating lease term, high range	35 years