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Fair Value (Nonrecurring Measurements) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 09, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other Asset Impairment Charges |  |  | $ 159 | $ 8
Other Nonoperating Expense |  |  | 2 | 0
Available-for-sale Securities, Gross Realized Gain (Loss) |  |  | 1 | 1
Long Lived Assets Held And Used [Member] | Other Entity [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other Asset Impairment Charges | [1] |  |  | 8
Long Lived Assets Held And Used [Member] | buffalo gap II [Member] [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other Asset Impairment Charges | [1] |  | 159 |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Entity [Member] | Level 1 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Entity [Member] | Level 2 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 21
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Entity [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 1 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 2 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Other Entity [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  | $ 29
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | buffalo gap II [Member] [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  | 251 |
Equity Method Investments [Member] | Solar Spain [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other Nonoperating Expense |  | $ 0 |  |
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 1 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  |
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 2 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  |
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 29 |  |
Equity Method Investments [Member] | Carrying Amount [Member] | Solar Spain [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [2] | $ 29 |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  |  | $ 92 |
[1] | See Note 13—Asset Impairment Expense for further information.
[2] | (1) Represents the carrying values at the dates of measurement, before fair value adjustment.

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