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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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