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Shareholders' Equity (Shares of Treasury Stock) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	36,483,270	36,500,000
Beginning balance	$ 817	$ 818
Treasury stock acquired, net of ESPP shares issued (in shares)	0	0
Treasury stock acquired, net of ESPP shares issued	$ 0	$ (1)
Ending balance (in shares)	36,511,053	36,483,270	36,500,000
Ending balance	$ 817	$ 817	$ 818
Dividends declared to shareholders	$ 46	$ 44	$ 45

X

- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Number of shares that have been repurchased during the period and are being held in treasury.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.

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