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Common Stock - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of common stock, authorized | 1,000,000,000 | 1,000,000,000 |
Number of preferred stock, authorized | 10,000,000 |  |
Common stock, par value | $ 0.01 | $ 0.01 |
Preferred stock, par value | $ 0.01 |  |
Preferred stock, shares issued | 0 |  |
Preferred stock, shares outstanding | 0 |  |
Aggregated cash dividends paid | $ 389 | $ 209 | $ 191
Earlier authorized shares under stock based compensation | 39,500,000 |  |
Duration of performance-based restricted stock awards, vested | Stock option plan generally vest over a three-year period starting one year from the date of grant and expire ten years from the date of grant |  |
Remaining shares available for future grants under the Plan | 14,500,000 |  |
Stock option, Minimum Range | $ 9.14 |  |
Stock option, Maximum Range | $ 84.58 |  |
Weighted-average fair value of options granted | $ 24.11 | $ 30.01 | $ 29.52
Total intrinsic value of options exercised | 64 | 120 |
Total unrecognized compensation cost related to nonvested stock options | 74 |  |
Weighted-average period recognition of unrecognized compensation cost related to nonvested RSA's | 2 years |  |
Total fair value of stock options vested | 64 | 55 | 54
Cash received from option exercises | 58 | 113 | 96
Tax benefit realized for the tax deductions from option exercises | 39 | 42 | 43
Restricted stock granted | 758,176 | 482,428 | 374,425
Restricted stock granted fair value | $ 69.07 | $ 83.79 | $ 79.53
Number of shares available except for special grant | 16,352 |  |
Total stock-based compensation compensation arrangements under the Plan | 86 | 74 | 68
Total number of restricted stock awards and restricted stock units granted | 340,218 | 406,844 | 496,642
Restricted Stock and Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock granted | 540,194 |  |
Restricted stock granted fair value | $ 69.33 |  |
TSR Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance based restricted stock awards granted in percent | 50.00% |  |
ROC Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance based restricted stock awards granted in percent | 50.00% |  |
Performance Based Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation compensation arrangements under the Plan | 8 |  |
Restricted Stock Unit [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock granted | 16,702 |  |
Restricted stock granted fair value | $ 69.17 |  |
Restricted Stock Unit [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Duration of performance-based restricted stock awards, vested | Restricted stock and restricted stock units were granted February 15, 2013 and vest on the third anniversary of the date of grant, except for a special grant of 16,352 restricted stock units which vest on the second anniversary of the date of grant (subject to the satisfaction of a performance condition). On May 22, 2013, the 16,702 restricted stock awards, with a fair value of $69.17 per share, were granted to the non-employee members of the board of directors. These restricted stock awards vest in equal thirds over three years on the anniversary of the grant date. |  |
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Duration of performance-based restricted stock awards, vested | Restricted stock awards vest in equal thirds over three years on the anniversary of the grant date |  |
Total unrecognized compensation cost related to nonvested stock options | $ 54 |  |
Weighted-average period recognition of unrecognized compensation cost related to nonvested RSA's | 2 years |  |
Restricted stock granted fair value | $ 69.07 | $ 83.79 | $ 79.53
Performance based restricted stock awards vested, number of years | 3 years |  |
Total number of restricted stock awards and restricted stock units granted | 340,218 | 406,844 | 496,642
Minimum [Member] | Performance-base restricted stock [Member] | Senior Management Employees [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock granted | 0 |  |
Maximum [Member] | Performance-base restricted stock [Member] | Senior Management Employees [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock granted | 368,860 |  |

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