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Employee Benefit Plans (Details) (USD $)
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12 Months Ended |
|
Dec. 31, 2012
Y
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Dec. 31, 2011
|
Dec. 31, 2010
|
| Stock based compensation by job function [Line Items] |
|
|
|
| Compensation expense related to the company's stock-based compensation plans |
$ 127,504,000 |
$ 128,205,000 |
$ 107,314,000 |
| Maximum shares of stock-based awards approved |
12,900,000 |
|
|
| Common Shares Available for Grant |
3,400,000 |
|
|
| Federal income tax (expense) / benefit recognized from stock-based compensation |
67,000,000 |
25,000 |
(1,000,000) |
| Maximum term of stock options and SARs granted (in years) |
10 |
|
|
| Percentage of the fair market value at which employees may purchase company stock via the ESPP |
85 |
|
|
| Maximum Percentage Of Employee Pay Eligible For Contribution To Espp Percentage |
10.00% |
|
|
| Term Of Espp Offering Period Description |
two six-month offering periods |
|
|
| Stock-based compensation expense related to stock options, SAR and ESPP grants |
49,000,000 |
48,000,000 |
41,000,000 |
| Share-Based Compensation Arrangement By Share-Based Payment Award[Abstract] |
|
|
|
| Available for Future Grant (in shares) |
3,400,000 |
|
|
| Stock options/SARs vested or expected to vest (in shares) |
5,982,406 |
|
|
| Weighted average grant price for stock options/SARs vested or expected to vest (per share) |
$ 85.36 |
|
|
| Intrinsic value of stock options/SARs vested or expected to vest |
212,000,000 |
|
|
| Weighted Average Remaining Contractual Life for Stock Options/SARs Vested or Expected to Vest |
4.1 |
|
|
| Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |
|
|
|
| Stock Options and SARs Outstanding |
6,219,000 |
|
|
| Weighted Average Remaining Life for Outstanding Options and SARs |
4 |
|
|
| Weighted Average Grant Price For Outstanding Options and SARs |
$ 85.81 |
|
|
| Aggregate Intrinsic Value For Outstanding Options and SARs |
217,879,000 |
|
|
| Stock Options and SARs Exercisable |
3,143,000 |
|
|
| Weighted Average Remaining Life For Exercisable Units |
3 |
|
|
| Weighted Average Grant Price For Exercisable Options and SARs |
$ 74.98 |
|
|
| Aggregate Intrinsic Value For Exercisable Units |
144,335,000 |
|
|
|
Grant Price Range 1 [Member]
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|
|
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| Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |
|
|
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| Stock Options and SARs Outstanding |
846,000 |
|
|
| Weighted Average Remaining Life for Outstanding Options and SARs |
1 |
|
|
| Weighted Average Grant Price For Outstanding Options and SARs |
$ 45.84 |
|
|
| Stock Options and SARs Exercisable |
838,000 |
|
|
| Weighted Average Remaining Life For Exercisable Units |
1 |
|
|
| Weighted Average Grant Price For Exercisable Options and SARs |
$ 45.62 |
|
|
|
Grant Price Range 2 [Member]
|
|
|
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| Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |
|
|
|
| Stock Options and SARs Outstanding |
1,168,000 |
|
|
| Weighted Average Remaining Life for Outstanding Options and SARs |
3 |
|
|
| Weighted Average Grant Price For Outstanding Options and SARs |
$ 78.44 |
|
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| Stock Options and SARs Exercisable |
932,000 |
|
|
| Weighted Average Remaining Life For Exercisable Units |
3 |
|
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| Weighted Average Grant Price For Exercisable Options and SARs |
$ 77.64 |
|
|
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Grant Price Range 3 [Member]
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|
|
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| Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |
|
|
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| Stock Options and SARs Outstanding |
1,767,000 |
|
|
| Weighted Average Remaining Life for Outstanding Options and SARs |
5 |
|
|
| Weighted Average Grant Price For Outstanding Options and SARs |
$ 85.14 |
|
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| Stock Options and SARs Exercisable |
790,000 |
|
|
| Weighted Average Remaining Life For Exercisable Units |
4 |
|
|
| Weighted Average Grant Price For Exercisable Options and SARs |
$ 87.14 |
|
|
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Grant Price Range 4 [Member]
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|
|
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| Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |
|
|
|
| Stock Options and SARs Outstanding |
1,157,000 |
|
|
| Weighted Average Remaining Life for Outstanding Options and SARs |
4 |
|
|
| Weighted Average Grant Price For Outstanding Options and SARs |
$ 93.37 |
|
|
| Stock Options and SARs Exercisable |
508,000 |
|
|
| Weighted Average Remaining Life For Exercisable Units |
4 |
|
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| Weighted Average Grant Price For Exercisable Options and SARs |
$ 92.76 |
|
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Grant Price Range 5 [Member]
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|
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| Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |
|
|
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| Stock Options and SARs Outstanding |
1,281,000 |
|
|
| Weighted Average Remaining Life for Outstanding Options and SARs |
6 |
|
|
| Weighted Average Grant Price For Outstanding Options and SARs |
$ 113.03 |
|
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| Stock Options and SARs Exercisable |
75,000 |
|
|
| Weighted Average Remaining Life For Exercisable Units |
4 |
|
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| Weighted Average Grant Price For Exercisable Options and SARs |
$ 121.24 |
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Stock Options And Sars [Member]
|
|
|
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| Weighted Average Fair Value And Valuation Assumptions Used To Value Stock-Based Compensation [Abstract] |
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|
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| Weighted Average Fair Value of Grants |
$ 37.95 |
$ 29.92 |
$ 32.12 |
| Expected Volatility (in hundredths) |
39.68% |
40.96% |
39.70% |
| Risk-Free Interest Rate (in hundredths) |
0.45% |
0.58% |
0.87% |
| Dividend Yield (in hundredths) |
0.60% |
0.70% |
0.70% |
| Expected Life (in years) |
5.6 |
5.6 |
5.5 |
| Stock option and SAR Rollforward [Abstract] |
|
|
|
| Outstanding at January 1 |
8,374,000 |
8,445,000 |
8,335,000 |
| Granted |
1,240,000 |
1,509,000 |
1,450,000 |
| Exercised (1) |
(3,246,000) |
(1,399,000) |
(1,144,000) |
| Forfeited |
(149,000) |
(181,000) |
(196,000) |
| Outstanding at December 31 |
6,219,000 |
8,374,000 |
8,445,000 |
| Share-Based Compensation Arrangement By Share-Based Payment Award[Abstract] |
|
|
|
| Outstanding at January 1 - Price per Share |
$ 70.01 |
$ 64.49 |
$ 57.08 |
| Granted - Price Per Share |
$ 111.97 |
$ 85.29 |
$ 93.07 |
| Exercised - Price Per Share |
$ 54.80 |
$ 50.86 |
$ 43.38 |
| Forfeited - Price per Share |
$ 91.18 |
$ 87.74 |
$ 84.22 |
| Outstanding at December 31 - Price per Share |
$ 85.81 |
$ 70.01 |
$ 64.49 |
| Stock Options/SARs Exercisable at December 31 (in shares) |
3,143,000 |
5,148,000 |
5,439,000 |
| Stock Options/SARs Exercisable at December 31 (price per share) |
$ 74.98 |
$ 59.19 |
$ 51.71 |
| Intrinsic value of stock options/SARs exercised during the period |
185,000,000 |
78,000,000 |
66,000,000 |
| Unrecognized compensation expense |
91,000,000 |
|
|
| Weighted average period over which unrecognized compensation expense will be recognized (in years) |
2.8 |
|
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|
Espp [Member]
|
|
|
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| Stock based compensation by job function [Line Items] |
|
|
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| Common Shares Available for Grant |
625,000 |
|
|
| Weighted Average Fair Value And Valuation Assumptions Used To Value Stock-Based Compensation [Abstract] |
|
|
|
| Weighted Average Fair Value of Grants |
$ 25.11 |
$ 22.75 |
$ 25.45 |
| Expected Volatility (in hundredths) |
40.92% |
29.82% |
38.30% |
| Risk-Free Interest Rate (in hundredths) |
0.11% |
0.14% |
0.18% |
| Dividend Yield (in hundredths) |
0.60% |
0.70% |
0.70% |
| Expected Life (in years) |
0.5 |
0.5 |
0.5 |
| Share-Based Compensation Arrangement By Share-Based Payment Award[Abstract] |
|
|
|
| Available for Future Grant (in shares) |
625,000 |
|
|
| Approximate Number of Participants |
1,705 |
1,525 |
1,236 |
| Shares Purchased |
164,000 |
135,000 |
114,000 |
| Aggregate Purchase Price |
12,522,000 |
10,947,000 |
9,172,000 |
|
Restricted Stock And Restricted Stock Units [Member]
|
|
|
|
| Share-Based Compensation Arrangement By Share-Based Payment Award[Abstract] |
|
|
|
| Unrecognized compensation expense |
136,000,000 |
|
|
| Weighted average period over which unrecognized compensation expense will be recognized (in years) |
2.5 |
|
|
| Share Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost |
72,000,000 |
80,000,000 |
66,000,000 |
| Restricted Stock and Restricted Stock Unit [Roll Forward] |
|
|
|
| Outstanding at January 1 |
4,240,000 |
4,009,000 |
3,636,000 |
| Granted |
767,000 |
932,000 |
850,000 |
| Released (1) |
(1,059,000) |
(457,000) |
(364,000) |
| Forfeited |
(130,000) |
(244,000) |
(113,000) |
| Outstanding at December 31 (2) |
3,818,000 |
4,240,000 |
4,009,000 |
| Weighted Average Grant Price Restricted Stock and Restricted Stock Units Rollforward [Abstract] |
|
|
|
| Outstanding at January 1 (price per share) |
$ 82.93 |
$ 79.13 |
$ 73.69 |
| Granted (price per share) |
$ 112.17 |
$ 90.87 |
$ 93.39 |
| Released (1) (price per share) |
$ 72.70 |
$ 66.10 |
$ 58.00 |
| Forfeited (price per share) |
$ 85.36 |
$ 82.45 |
$ 79.37 |
| Outstanding at December 31 (2) (price per share) |
$ 91.06 |
$ 82.93 |
$ 79.13 |
| Intrinsic value of restricted stock and restricted stock units released during the year |
120,000,000 |
44,000,000 |
35,000,000 |
| Aggregate Intrinsic Value Of Restricted Stock And Restricted Stock Units |
461,000,000 |
418,000,000 |
|
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Performance Units and Performance Stock [Member]
|
|
|
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| Weighted Average Fair Value And Valuation Assumptions Used To Value Stock-Based Compensation [Abstract] |
|
|
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| Weighted Average Fair Value of Grants |
$ 134.09 |
|
|
| Expected Volatility (in hundredths) |
36.39% |
|
|
| Risk-Free Interest Rate (in hundredths) |
0.39% |
|
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| Dividend Yield (in hundredths) |
0.60% |
|
|
| Share-Based Compensation Arrangement By Share-Based Payment Award[Abstract] |
|
|
|
| Unrecognized compensation expense |
3,000,000 |
|
|
| Weighted average period over which unrecognized compensation expense will be recognized (in years) |
3.0 |
|
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| Performance Units and Performance Stock [Abstract] |
|
|
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| Performance Units Granted |
54,526 |
|
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| Performance Stock Granted |
16,752 |
|
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| Minimum Performance Units and Stock Allowed to be Outstanding |
0 |
|
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| Maximum Performance Units And Stock Allowed To Be Outstanding |
142,556 |
|
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| Share Based Compensation Arrangement By Performance Units and Stock Compensation Cost |
7,000,000 |
|
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| Term of Zero-Coupon Risk-Free Interest Rate (in years) Derived from the Treasury Constant Maturities Yield Curve |
3.26 |
|
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Lease And Well [Member]
|
|
|
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| Stock based compensation by job function [Line Items] |
|
|
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| Compensation expense related to the company's stock-based compensation plans |
35,000,000 |
33,000,000 |
27,000,000 |
|
Gathering And Processing Costs [Member]
|
|
|
|
| Stock based compensation by job function [Line Items] |
|
|
|
| Compensation expense related to the company's stock-based compensation plans |
1,000,000 |
1,000,000 |
1,000,000 |
|
Exploration Costs [Member]
|
|
|
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| Stock based compensation by job function [Line Items] |
|
|
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| Compensation expense related to the company's stock-based compensation plans |
27,000,000 |
26,000,000 |
24,000,000 |
|
General And Administrative [Member]
|
|
|
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| Stock based compensation by job function [Line Items] |
|
|
|
| Compensation expense related to the company's stock-based compensation plans |
65,000,000 |
68,000,000 |
55,000,000 |
|
Pension Plans Defined Benefit and Contribution [Member]
|
|
|
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| Defined Benefit and Defined Contribution Plan Disclosure [Line Items] |
|
|
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| Total pension plan costs |
36,000,000 |
27,000,000 |
23,000,000 |
| Company contributions to foreign pension plans |
3,000,000 |
3,000,000 |
3,000,000 |
| Benefit obligation |
14,000,000 |
11,000,000 |
|
| Fair value of foreign pension plan assets |
10,000,000 |
8,000,000 |
|
| Accrued benefit cost |
$ (2,000,000) |
$ (2,000,000) |
|