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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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Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: