Borrowings and Contractual Commitments Contractual Commitments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Long-term Purchase Commitment [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 208
Capital Lease Obligations, Current	1	[1]
Purchase Obligation, Due in Next Twelve Months	284	[2]
Contractual Obligation, Due in Next Twelve Months	493
Operating Leases, Future Minimum Payments, Due in Two and Three Years	386
Capital Leases, Future Minimum Payments Due in Two and Three Years	3	[1]
Purchase Obligation, Due in Second and Third Year	65	[2]
Contractual Obligation, Due in Second and Third Year	454
Operating Leases, Future Minimum Payments, Due in Four and Five Years	262
Capital Leases, Future Minimum Payments Due in Four and Five Years	4	[1]
Purchase Obligation, Due in Fourth and Fifth Year	31	[2]
Contractual Obligation, Due in Fourth and Fifth Year	297
Operating Leases, Future Minimum Payments, Due Thereafter	354
Capital Leases, Future Minimum Payments, Due in Rolling after Year Five	2	[1]
Purchase Obligation, Due after Fifth Year	8	[2]
Contractual Obligation, Due after Fifth Year	364
Operating Leases, Future Minimum Payments Due	1,210
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	10	[1]
Purchase Obligation	388	[2]
Contractual Obligation	$ 1,608

[1] Amounts do not include accrued interest.

[2] Represents aggregation of termination fees on legally binding contracts to purchase goods or services that have a minimum termination fee of $5 million or more. Amounts paid under these contracts totaled $194 million during 2013; however, there is no minimum annual payment other than termination fees required.