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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation, net of tax | $ 137 | $ 103 | $ 97
Unrecognized compensation cost | $ 101 |  |
Period over which unrecognized compensation costs are expected to be recognized (years) | 1 year 9 months 18 days |  |
Realized tax benefits from stock-based compensation activities | $ 75 | $ 203 | 219
Weighted average remaining contractual life, vested | 3 years |  |
Number of years over which equity awards expire | 10 years |  |
Number of shares authorized (in shares) | 9,000 |  |
Shares reserved for issuance (in shares) | 5,000 |  |
Number of years over which equity awards vest | 3 years |  |
Number of stock options, outstanding (in shares) | 1,800 | 2,200 |
Weighted average exercise price, outstanding (in dollars per share) | $ 79.76 | $ 82.71 |
Weighted average remaining contractual life, outstanding | 1 year 10 months 18 days |  |
Aggregate intrinsic value, outstanding | $ 326 |  |
Number of stock options, vested (in shares) | 400 |  |
Weighted average exercise price, vested (in dollars per share) | $ 94.63 |  |
Intrinsic value of all stock options exercised | $ 104 | $ 139 | 172
Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash received from exercise of stock options | $ 43 | $ 71 | $ 106
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock, granted (in shares) | 406 | 519 | 679
Average grant date fair value per unit (in dollars per share) | $ 353.99 | $ 254.58 | $ 206.69
Number of years over which equity awards vest | 3 years |  |
Performance Stock Units (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock, granted (in shares) | 100 |  |
Number of years over which equity awards vest | 3 years |  |
Performance Stock Units (PSUs) | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of shares that can be earned from stock awards, as a percentage of the target award | 0.00% |  |
Performance Stock Units (PSUs) | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of shares that can be earned from stock awards, as a percentage of the target award | 200.00% |  |
Performance Stock Units (PSUs) | Half Of PSUs Granted In Period |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Average grant date fair value per unit (in dollars per share) | $ 354.60 |  |
Performance Stock Units (PSUs) | Remaining Half Of PSUs Granted In Period |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Average grant date fair value per unit (in dollars per share) | $ 420.75 |  |
Segment Reconciling Items |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation | $ (173) | $ (158) | $ (149)

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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