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Number of peer groups.

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Number of Performance-Based Programs

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Percentage Of Target Amount Granted Maximum

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Percentage Of Target Amount Granted Minimum

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Rate of Discount given to Employees.

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Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Shares Earned Maximum

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Share-based Compensation Arrangement by Share-based Payment Award, Term Of Agreement

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Grants in Period

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

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Discount rate from fair value on purchase date that participants pay for shares.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of share options (or share units) exercised during the current period.

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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2022 shares	Mar. 31, 2022 USD ($) $ / shares peerGroup shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 program	Dec. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares) \| shares		9,300,000
Options outstanding (in shares) \| shares		473,441			268,817
Granted (in shares) \| shares		204,624
Stock option exercises, net (in shares) \| shares			24,409
Net cash proceeds from the exercise of stock options \| $			$ 1
Aggregate Intrinsic Value, exercisable (in millions) \| $		$ 30
Stock options, exercisable (in shares) \| shares		268,817	300,000
Options exercisable, weighted average exercise price (in dollars per share) \| $ / shares		$ 66.68	$ 66.68
Total pre-tax intrinsic value of stock options exercised \| $			$ 3
Share based compensation expense \| $		$ 25	$ 19
Commercial Paper and Letter Of Credit \| Clearinghouse Credit Facilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in dollars per share) \| $ / shares		$ 178.20
Employment Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares	204,624		0
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount from market price (as a percent)		15.00%	15.00%
Common stock shares reserved for future issuance (in shares) \| shares		4,200,000
Maximum percentage of shares purchased from annual compensation		10.00%
Discount given to employees (as a percent)		15.00%
Share based compensation expense \| $		$ 3	$ 2
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost \| $		$ 71
Weighted-average period unrecognized compensation cost is expected to be recognized, in years		1 year 8 months 12 days
PSUs \| One-Year Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost \| $		$ 1
Weighted-average period unrecognized compensation cost is expected to be recognized, in years		1 year
Expiration period		1 year		1 year
Percentage of target amount granted, minimum		0.00%
Percentage of target amount granted, maximum		150.00%
PSUs \| Three-Year Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost \| $		$ 36
Weighted-average period unrecognized compensation cost is expected to be recognized, in years		1 year 3 months 18 days
Expiration period		3 years		3 years
Performance period		3 years
Number of peer groups (in peer groups) \| peerGroup		2
Performance-based long-term incentive program weighted percentage		50.00%
Minimum payout (as a percent)		0.00%
Maximum payout (as a percent)		200.00%
Additional units granted above target (in shares) \| shares		289,307
PSUs \| Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance-based programs (in programs) \| program				2
PSUs, Negative TSR \| Three-Year Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum payout (as a percent)		100.00%
Employee stock option \| Employment Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Agreement term	5 years
First Anniversary \| Restricted Stock \| Below Manager Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)		33.30%
First Anniversary \| Employee stock option \| Employment Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)	50.00%
Second Anniversary \| Restricted Stock \| Below Manager Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)		33.30%
Second Anniversary \| Restricted Stock \| At or Above Manager Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)		33.30%
Second Anniversary \| Employee stock option \| Employment Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)	50.00%
Vesting period	5 years
Third Anniversary \| Restricted Stock \| Below Manager Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)		33.30%
Third Anniversary \| Restricted Stock \| At or Above Manager Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)		33.30%
Fourth Anniversary \| Restricted Stock \| At or Above Manager Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)		33.30%