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Fair Value Disclosures - Narrative (Details) - Level 3 [Member] - USD ($) $ in Billions | Jun. 30, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets and Liabilities, Fair Value Disclosure | $ 5.3 | $ 4.9
Fair Value, Assets and Liabilities Fair Value as Percent of Total Assets | 31.00% | 31.00%
Fair Value, Assets and Liabilities, Fair Value as Percent of Total Financial Instruments Measured at Fair Value | 69.00% | 65.00%

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