Income Taxes - Operating Loss Carryforward (Details) (USD $)	Dec. 31, 2011
U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 6,791,000,000
Internal Revenue Code 382, Cumulative Ownership Shift Benchmark	50.00%
Internal Revenue Code 382, Cumulative Ownership Shift Period Change	5.00%
Foreign jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	4,300,000,000
Operating Loss Carryforward, Disregarded for Domestic Country Tax Purposes	2,400,000,000
German Change of Control Rules Benchmark, Transactions Result in a Cumulative Ownership Shift	25.00%
State jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5,400,000,000
Expiring, 2024 | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	533,000,000
Expiring, 2025 | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,186,000,000
Expiring, 2026 | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,029,000,000
Expiring, 2027 | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,508,000,000
Expiring, 2028 | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	445,000,000
Expiring, 2029 | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	700,000,000
Expiring, 2030 | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	703,000,000
Operating Loss Expiring, 2031 [Member] | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	687,000,000
Level 3 Segment | U.S. Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 6,500,000,000