Income Taxes - Operating Loss Carryforward (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, increase	$ 300,000,000
Deferred Tax Assets, Valuation Allowance	4,698,000,000	4,697,000,000
U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, increase	1,000,000,000
Operating Loss Carryforwards	9,058,000,000
Deferred Tax Assets, Valuation Allowance	4,700,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2023
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	220,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2024
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,302,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2025
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,186,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2026
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,064,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2027
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,644,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2028
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	482,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2029
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	694,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2030
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	687,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2031
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	832,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2032
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	726,000,000
U.S. Internal Revenue Service (IRS) | Expiring, 2033
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	221,000,000
Foreign jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforward, Disregarded for Domestic Country Tax Purposes	6,500,000,000
State jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 7,200,000,000