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Fair Value Measurements Other Segments Fair Value (Details) - Other Segments and Holding Company [Member] - Fair Value, Measurement Frequency [Domain] - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets [Abstract] |  |  |
Derivative contracts, at fair value (asset) | [1] | $ 23 | $ 47
Assets, Fair Value Disclosure |  | 231 | 288
Liabilities [Abstract] |  |  |
Other Liabilities, Fair Value Disclosure |  | 14 | 50
Derivative contracts at fair value (liability) | [2] | 8 | 2
Available-for-sale Securities |  | 208 | 186
Trading Securities |  | 0 | 55
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 22 | 52
Fair Value, Inputs, Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 10 | 75
Liabilities [Abstract] |  |  |
Other Liabilities, Fair Value Disclosure |  | 0 | 0
Derivative contracts at fair value (liability) | [2] | 0 | 0
Available-for-sale Securities |  | 10 | 75
Trading Securities |  | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Derivative contracts, at fair value (asset) | [1] | 23 | 47
Assets, Fair Value Disclosure |  | 23 | 50
Liabilities [Abstract] |  |  |
Other Liabilities, Fair Value Disclosure |  | 14 | 50
Derivative contracts at fair value (liability) | [2] | 8 | 2
Available-for-sale Securities |  | 0 | 3
Trading Securities |  | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 22 | 52
Fair Value, Inputs, Level 3 [Member] |  |  |
Assets [Abstract] |  |  |
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 198 | 163
Liabilities [Abstract] |  |  |
Other Liabilities, Fair Value Disclosure |  | 0 | 0
Derivative contracts at fair value (liability) | [2] | 0 | 0
Available-for-sale Securities |  | 198 | 108
Trading Securities |  | 0 | 55
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | $ 0 | $ 0
[1] | Amounts are classified within other assets in our condensed consolidated balance sheets.
[2] | Amounts are classified within accrued expenses and other liabilities in our condensed consolidated balance sheets.

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