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Note 2. Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2018 | Jan. 01, 2016
Item Effected [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ (22) | $ 5
Accounting Standards Update 2018-02 |  |  |
Item Effected [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 9 |
Assets | Scenario, Forecast | Minimum | Accounting Standards Update 2016-02 | Subsequent Event |  |  |
Item Effected [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 650 |  |
Assets | Scenario, Forecast | Maximum | Accounting Standards Update 2016-02 | Subsequent Event |  |  |
Item Effected [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 670 |  |
Liability | Scenario, Forecast | Minimum | Accounting Standards Update 2016-02 | Subsequent Event |  |  |
Item Effected [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 595 |  |
Liability | Scenario, Forecast | Maximum | Accounting Standards Update 2016-02 | Subsequent Event |  |  |
Item Effected [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 615 |  |

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