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Fair Value Disclosures - Narrative (Details) - Level 3 [Member] - USD ($) $ in Billions | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Asset and liability fair value | $ 6.5 | $ 6.0
Percent of level three fair value assets and liabilities | 33.00% | 32.00%
Financial instruments level three percent | 72.00% | 73.00%

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