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Fair Value Measurements (Textuals) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 26 $ 151 $ 103 $ 78
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income (16) 82 56  
Money Market Funds, at Carrying Value 2 22    
Deferred Compensation Plan Assets 8 6    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 6      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Net of Tax 4      
Assets, Fair Value Disclosure (5) (190)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (90) 135 87  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 10 4 4  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (45) (91) (66)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0 0  
Obligations, Fair Value Disclosure (16) (2)    
Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Gross Of Tax   (9)    
Natural Gas [Member]
       
Derivative Liability, Fair Value, Total (11)      
Natural Gas [Member] | Options Held [Member]
       
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value 1      
Natural Gas [Member] | Minimum [Member] | Options Held [Member]
       
Derivative, Forward Price 4.01      
Fair Value Assumptions Expected Volatility Curves 18.74%      
Fair Value Inputs, Entity Credit Risk 0.01%      
Natural Gas [Member] | Maximum [Member] | Options Held [Member]
       
Derivative, Forward Price 4.42      
Fair Value Assumptions Expected Volatility Curves 50.02%      
Fair Value Inputs, Entity Credit Risk 1.58%      
Oil contracts [Member]
       
Derivative Liability, Fair Value, Total (25)      
Oil contracts [Member] | Options Held [Member]
       
Derivative Liability, Fair Value, Total (9)      
Oil contracts [Member] | Minimum [Member] | Options Held [Member]
       
Derivative, Forward Price 86.29      
Fair Value Assumptions Expected Volatility Curves 14.33%      
Fair Value Inputs, Entity Credit Risk 0.01%      
Oil contracts [Member] | Maximum [Member] | Options Held [Member]
       
Derivative, Forward Price 98.77      
Fair Value Assumptions Expected Volatility Curves 23.22%      
Fair Value Inputs, Entity Credit Risk 0.89%      
Auction Rate Securities [Member]
       
Available-for-sale Securities, Fair Value Disclosure 39 36    
Swap [Member]
       
Derivative Assets   (6)    
Derivative Liability (28)      
Commodity Option [Member]
       
Derivative Assets   (115)    
Derivative Liability (8)      
Equity Securities [Member]
       
Available-for-sale Securities, Fair Value Disclosure 8 7    
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member]
       
Money Market Funds, at Carrying Value 2 22    
Deferred Compensation Plan Assets 8 6    
Assets, Fair Value Disclosure (7) (33)    
Obligations, Fair Value Disclosure (11) (2)    
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Auction Rate Securities [Member]
       
Available-for-sale Securities, Fair Value Disclosure 0 0    
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Swap [Member]
       
Derivative Assets 0 0    
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Commodity Option [Member]
       
Derivative Assets 0 0    
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Equity Securities [Member]
       
Available-for-sale Securities, Fair Value Disclosure 8 7    
Significant Other Observable Fair Value Inputs (Level 2) [Member]
       
Money Market Funds, at Carrying Value 0 0    
Deferred Compensation Plan Assets 0 0    
Assets, Fair Value Disclosure   (6)    
Financial and Nonfinancial Liabilities, Fair Value Disclosure (28)      
Obligations, Fair Value Disclosure 0 0    
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Auction Rate Securities [Member]
       
Available-for-sale Securities, Fair Value Disclosure 0 0    
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Swap [Member]
       
Derivative Assets   (6)    
Derivative Liability (28)      
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Commodity Option [Member]
       
Derivative Assets 0 0    
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Equity Securities [Member]
       
Available-for-sale Securities, Fair Value Disclosure 0 0    
Fair Value, Inputs, Level 3 [Member]
       
Money Market Funds, at Carrying Value 0 0    
Deferred Compensation Plan Assets 0 0    
Assets, Fair Value Disclosure (26) (151)    
Obligations, Fair Value Disclosure (5) 0    
Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member]
       
Available-for-sale Securities, Fair Value Disclosure 39 36    
Fair Value, Inputs, Level 3 [Member] | Swap [Member]
       
Derivative Assets 0 0    
Fair Value, Inputs, Level 3 [Member] | Commodity Option [Member]
       
Derivative Assets   (115)    
Derivative Liability (8)      
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
       
Available-for-sale Securities, Fair Value Disclosure 0 0    
Investments [Member]
       
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 39 36 32 30
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income (6) 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (6) 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 10 4 4  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1) 0 (2)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0 0  
Derivative Financial Instruments, Assets [Member]
       
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   115 71 48
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income   82 56  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   135 87  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (91) (64)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   0 0  
5.75 %Senior Notes Due 2022 [Member]
       
Debt Instrument, Fair Value Disclosure 767 836    
5.625% Senior Notes Due 2024 [Member]
       
Debt Instrument, Fair Value Disclosure 1,025 1,074    
7.125% Senior Subordinated Notes due 2018 [Member]
       
Debt Instrument, Fair Value Disclosure 624 630    
6.875% Senior Subordinated Notes due 2020 [Member]
       
Debt Instrument, Fair Value Disclosure 755 749    
Stockholder Value Appreciation Program [Member]
       
Liability Value (5)      
Derivative Financial Instruments, Assets [Member]
       
Liability Value (8)      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income (10)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (66)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (57)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0      
Stock Compensation Plan [Member]
       
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   0 0 0
Liability Value (5)      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income 0 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (18) 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 13      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net $ 0 $ 0 $ 0  
Implied [Member] | Stockholder Value Appreciation Program [Member]
       
SBC Expected Volatility Rate, Maximum 37.40%      
Implied [Member] | Stockholder Value Appreciation Program [Member]
       
SBC Expected Volatility Rate, Maximum 41.20%