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Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Risk premium adjustment assumption to project change in fair value of loan | 1.00%
Carrying value of property, plant and equipment impaired during the period | $ 48
Impairment of property, plant, and equipment | 19
Carrying value of intangibles impaired during the period | 77
Impairment of intangible assets (Excluding goodwill) | 15
Investment Segment [Member] |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Change in fair value of loan from 1 percent change in risk premium | 3.00%
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Unrealized losses included in earnings related to Level 3 investments | 2
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Fair value of property, plant, and equipment impaired during the period | 29
Fair value of intangibles impaired during the period | $ 62

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