Share-based Compensation - Narrative (Detail) - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax (expense) benefits recognized for stock-based compensation	$ 26,000,000	$ 54,000,000	$ 32,000,000
Excess tax benefit related to share-based compensation	4,000,000	32,000,000	10,000,000
Amount received on stock options exercised	$ 59,000,000	62,000,000	72,000,000
Long Term Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and available for awards	20,900,000
Charges for plan	$ 353,000,000	331,000,000	376,000,000
Unrecognized compensation cost	0	0
Intrinsic value of exercised options	15,000,000	27,000,000	45,000,000
Amount received on stock options exercised	3,000,000	10,000,000	26,000,000
Tax benefit realized from exercise of stock options	$ 24,000,000	$ 58,000,000	$ 33,000,000
Long Term Incentive Plans \| Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life	3 years	3 years	3 years
Volatility rate	48.00%	46.00%	46.00%
Weighted-average period for recognition of compensation cost	1 year 10 months 24 days	1 year 8 months 12 days	2 years
Fair value of vested shares	$ 42,000,000	$ 395,000,000	$ 0
Unrecognized compensation cost	$ 100,000,000	$ 90,000,000	$ 89,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.60%	1.10%	1.30%
Relative TSR	3.40%	6.50%	(0.70%)
Long Term Incentive Plans \| Performance Share Units \| Market Performance Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of units granted (in dollars per share)	$ 188.70	$ 257.18	$ 164.92
Shares granted during the period (in shares)	365,112
Long Term Incentive Plans \| Performance Share Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted common shares per target units	0
Long Term Incentive Plans \| Performance Share Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted common shares per target units	2
Long Term Incentive Plans \| Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Weighted average grant date fair value of units granted (in dollars per share)	$ 147.73	$ 201.68	$ 129.05
Weighted-average period for recognition of compensation cost	1 year 7 months 6 days	1 year 7 months 6 days	1 year 6 months
Shares granted during the period (in shares)	2,927,198
Fair value of vested shares	$ 319,000,000	$ 533,000,000	$ 372,000,000
Unrecognized compensation cost	$ 621,000,000	$ 546,000,000	$ 502,000,000
Special Termination Benefits \| Long Term Incentive Plans \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year

Employee service share based compensation excess tax benefit from compensation expense portion of excess tax benefits.

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Initial TSR

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Share-based compensation arrangement by share-based payment award granted common shares.

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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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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.

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Number of shares authorized for issuance under share-based payment arrangement.

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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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Expected term of 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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