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Note 2. Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2016
--- | --- | ---
Item Effected [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 5
Subsequent Event |  |
Item Effected [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 9 |

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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- Details
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