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Common Stock (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2011 | Dec. 31, 2011 | Dec. 31, 2011 Y | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Restricted stock [Member] Y | Dec. 31, 2010 Restricted stock [Member] | Dec. 31, 2009 Restricted stock [Member] | Dec. 31, 2011 Restricted stock [Member] Non Employee [Member] | Feb. 16, 2010 Performance-base restricted stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options granted, weighted average exercise price |  | $ 79.68 | $ 79.68 | $ 44.03 | $ 26.03 | $ 0.00 |  |  |  |
Percentage of performance based restricted stock award vesting | 100.00% |  |  |  |  |  |  |  |  |
Duration of performance-based restricted stock awards, vested | P36M |  | Option generally vest over a three-year period starting one year from the date of grant and expire ten years from the date of grant |  |  | equal thirds over three years on the anniversary of the grant date |  |  |  |
Total number of restricted stock awards and restricted stock units granted | 234,620 |  | 496,642 | 921,454 | 7,322 | 496,642 | 921,454 | 7,322 | 8,505 |
Restricted stock granted, shares |  |  | 374,425 | 558,531 | 762,692 |  |  |  |  | 131,300
Weighted-average grant day fair value of RSA's granted |  |  | $ 79.53 | $ 43.99 | $ 26.02 | $ 79.53 | $ 43.99 | $ 26.02 |  |
Total unrecognized compensation cost related to nonvested stock options |  | $ 68 | $ 68 |  |  | $ 30 |  |  |  |
Weighted-average period recognition of unrecognized compensation cost related to nonvested RSA's |  |  | 2 |  |  | 2 |  |  |  |
Common Stock (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Number of common stock, authorized |  | 1,000,000,000 | 1,000,000,000 |  |  |  |  |  |  |
Common stock, par value |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |  |
Common stock, shares issued |  | 423,900,601 | 423,900,601 | 421,141,751 |  |  |  |  |  |
Common stock, shares outstanding |  | 423,900,601 | 423,900,601 | 421,141,751 |  |  |  |  |  |
Number of preferred stock, authorized |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |
Preferred stock, par value |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |
Preferred stock, shares issued |  | 0 | 0 |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 0 | 0 |  |  |  |  |  |  |
Aggregated Cash Dividends Paid |  |  | 191 | 172 | 460 |  |  |  |  |
Earlier authorized shares under stock based compensation |  |  | 25,500,000 |  |  |  |  |  |  |
Remaining shares available for future grants under the Plan |  | 6,000,000 | 6,000,000 |  |  |  |  |  |  |
Stock option, Minimum Range |  | $ 8.38 |  |  |  |  |  |  |  |
Stock option, Maximum Range |  | $ 79.80 |  |  |  |  |  |  |  |
Weighted-average fair value of options granted |  |  | $ 29.52 | $ 16.73 | $ 11.89 |  |  |  |  |
Total intrinsic value of options exercised |  |  | 102 | 60 |  |  |  |  |  |
Total fair value of stock options vested |  |  | 54 | 78 | 40 |  |  |  |  |
Cash received from option exercises |  |  | 96 | 73 | 8 |  |  |  |  |
Tax benefit realized for the tax deductions from option exercises |  |  | $ 43 | $ 16 | $ 2 |  |  |  |  |

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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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 stock options awarded under the plan during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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