Capital Stock - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
Jun. 10, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options and restricted stock, anti-dilutive		4,500,000	4,900,000	4,400,000
Common stock share purchase, shares		40,000,000
Common stock share repurchase, shares	32,200,000us-gaap_TreasuryStockSharesAcquired	20,950,729us-gaap_TreasuryStockSharesAcquired	11,221,919us-gaap_TreasuryStockSharesAcquired
Common stock share repurchase, per share	$ 88.96	$ 89.00
Dividends, Common stock		$ 0.95	$ 0.77	$ 0.66
Shares authorized and available for grant under 2011 Plan		18,300,000
Compensation expense		$ 148	$ 136	$ 167
Stock-based compensation expenses, after tax		95	94	119
Intrinsic value of options exercised		13	4	12
Cash received from exercise of options		49
Additional tax benefit for the amount of intrinsic value in excess of compensation cost		4.7
Granted, Weighted Average Grant-Date Fair Value		$ 86.87
Restricted stock, capitalized		62	55	67
Percentage of additional vest on succeeding anniversaries			25.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		93	82	74
Stock-based compensation expenses, after tax		60	53	48
Total compensation cost related to non-vested options not yet recognized		316
Restricted stock units awarded		3,047,000	3,098,029	1,219,886
Granted, Weighted Average Grant-Date Fair Value		$ 86.87	$ 82.95	$ 85.67
Restricted stock, capitalized		43	30	25
Weighted-average remaining life of unvested restricted stock units		1 year 2 months 12 days
Unvested restricted stock units		4,783,524
Total fair value of restricted stock awards vested		138	88	114
Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, vested (Percentage)		50.00%
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period in which stock options become exercisable		4 years
Period in which stock options expires after grant date		10 years
Total compensation cost related to non-vested options not yet recognized		$ 24
Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options and restricted stock, anti-dilutive				14,300,000

Allocated share-based compensation expense after tax.

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Percentage of additional vest on succeeding anniversaries.

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Restricted stock units vested percentage.

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Weighted-average remaining life of unvested restricted stock units.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 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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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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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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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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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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