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Stock-based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) director $ / shares shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive stock option, exercise period, maximum, in years	10 years
Maximum number of shares, options, SARs, or stock units granted or awarded in calendar year per participant	200,000
Maximum aggregate number of shares of common stock that may be issued under the Plan	1,000,000
Shares available for grant (in shares)	954,028
Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares)	6,779
Stock awards weighted average grant date fair value (in dollars per share) | $ / shares	$ 414.33	$ 440.42	$ 415.98
Fair value of shares vested | $	$ 2	$ 1	$ 3
Compensation expense | $	2	$ 2	$ 2
Unrecognized compensation expense | $	$ 5
Period for recognition of unrecognized compensation expense, in years	3 years 1 month 6 days
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares)	1,120
Number of non-employee directors | director	5

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Number of non-employee directors serving on the Board of Directors of the entity.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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