Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option expense related to retirement eligibility vesting	$ 97	$ 88	$ 65
Stock option exercisable period - minimum (years)	1 year
Stock option exercisable period - maximum (years)	10 years
Granted (shares)	0
Total intrinsic value of options exercised	$ 130	118	67
Cash received from option exercises	326	370	263
Actual tax benefit realized for the tax deductions from options exercised	$ 21	17	8
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, authorized shares (shares)	42,097,582
Stock based compensation cost	$ 10	28	49
Stock based compensation cost, tax benefit recognized	4	11	20
Unrecognized compensation cost related to nonvested awards	$ 1
Unrecognized compensation cost expected to be recognized for nonvested award over a weighted-average period, years	3 months
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, authorized shares (shares)	27,453,939
Stock based compensation cost	$ 235	243	201
Stock based compensation cost, tax benefit recognized	83	94	79
Unrecognized compensation cost related to nonvested awards	$ 190
Unrecognized compensation cost expected to be recognized for nonvested award over a weighted-average period, years	1 year 7 months 6 days
Shares granted (shares)	6,948,487
Total fair value of stock based compensation that vested during the period	$ 429	$ 229	$ 117
Share-based compensation payment award, equity instruments other than options, nonvested, number	16,983,971	21,400,291
Restricted Stock and Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, vesting period	1 year
Restricted Stock and Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, vesting period	4 years
Performance Units \| Executive Committee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, vesting period		3 years
Shares granted (shares)	630,100	719,947	942,428
Subsidiary Long-Term Incentive Plans \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, required service period	0 years
Subsidiary Long-Term Incentive Plans \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, required service period	3 years
Restructuring Charges \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation cost		$ 1
Restructuring Charges \| Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation cost		$ 13

Share Based Compensation Arrangement By Share Based Payment Award Maximum Exercisable Period For Stock Options

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Share Based Compensation Arrangement By Share Based Payment Award Minimum Exercisable Period For Stock Options

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Stock Option Plan Expense Related To Retirement Eligibility Vesting

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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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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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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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