Significant Transactions (Leased Devices) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Property Subject to or Available for Operating Lease, Net [Abstract]
Leased devices, gross	$ 814
Accumulated depreciation	(50)
Leased devices, net	764
Operating Leases, Future Minimum Payments Receivable [Abstract]
Leased devices, operating leases, future minimum payments receivable, in one year	298
Leased devices, operating leases, future minimum payments receivable, in two years	141
Leased devices, operating leases, future minimum payments receivable	$ 439
Maximum [Member]
Property, Plant and Equipment [Line Items]
Leased devices, lease term	18 months