Income Taxes - Deferred Tax Assets (Liabilities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets:
Accrued payroll and related benefits	$ 132,000,000	$ 119,000,000
Deferred revenue	336,000,000	271,000,000
Unutilized tax net operating loss carry forwards	4,791,000,000	4,611,000,000
Fixed assets and intangible assets	102,000,000	134,000,000
Intercompany loss	139,000,000	148,000,000
Other	144,000,000	162,000,000
Total Deferred Tax Assets	5,644,000,000	5,445,000,000
Deferred Tax Liabilities:
Fixed assets and intangible assets	(790,000,000)	(702,000,000)
Deferred revenue	(76,000,000)	(87,000,000)
Other	(33,000,000)	(45,000,000)
Foreign branch income	(163,000,000)	(37,000,000)
Total Deferred Tax Liabilities	(1,062,000,000)	(871,000,000)
Net Deferred Tax Assets before valuation allowance	4,582,000,000	4,574,000,000
Valuation Allowance	(4,698,000,000)	(4,697,000,000)
Net Deferred Tax (Liability) Asset after Valuation Allowance	116,000,000	123,000,000
Net current deferred income tax asset	9,000,000	9,000,000
Net current deferred income tax liability	(2,000,000)	(3,000,000)
Net non-current deferred income tax asset	211,000,000	219,000,000
Net non-current deferred income tax liability	(334,000,000)	(348,000,000)
Operating Loss Carryforwards, increase	300,000,000
U.S. Internal Revenue Service (IRS)
Deferred Tax Liabilities:
Valuation Allowance	(4,700,000,000)
Operating Loss Carryforwards, increase	1,000,000,000
Internal Revenue Code 382, Cumulative Ownership Shift Benchmark	50.00%
Internal Revenue Code 382, Cumulative Ownership Shift Period Change	5.00%
Operating Loss Carryforwards	$ 9,058,000,000