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Debt and Interest Expense (Tables)
 12 Months Ended
Dec. 31, 2012
Table Text Block [Abstract]  
Debt Outstanding and Debt Activity Tables
      
 December 31,
millions2012 2011
6.125% Senior Notes due 2012$ — $131
5.000% Senior Notes due 2012  —  39
5.750% Senior Notes due 2014 275  275
7.625% Senior Notes due 2014 500  500
5.950% Senior Notes due 2016 1,750  1,750
6.375% Senior Notes due 2017 2,000  2,000
7.050% Debentures due 2018 114  114
6.950% Senior Notes due 2019 300  300
8.700% Senior Notes due 2019 600  600
WES 5.375% Senior Notes due 2021 500  500
WES 4.000% Senior Notes due 2022 670   —
6.950% Senior Notes due 2024 650  650
7.500% Debentures due 2026 112  112
7.000% Debentures due 2027 54  54
7.125% Debentures due 2027 150  150
6.625% Debentures due 2028 17  17
7.150% Debentures due 2028 235  235
7.200% Debentures due 2029 135  135
7.950% Debentures due 2029 117  117
7.500% Senior Notes due 2031 900  900
7.875% Senior Notes due 2031 500  500
Zero-Coupon Senior Notes due 2036 2,360  2,360
6.450% Senior Notes due 2036 1,750  1,750
7.950% Senior Notes due 2039 325  325
6.200% Senior Notes due 2040 750  750
7.730% Debentures due 2096 61  61
7.500% Debentures due 2096 78  78
7.250% Debentures due 2096 49  49
$5.0 billion Facility  —  2,500
Total debt at face value$14,952 $16,952
Net unamortized discounts and premiums (1) (1,683)  (1,722)
Total borrowings$13,269 $15,230
Less current portion of long-term debt  —  170
Total long-term debt$13,269 $15,060
      

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(1)        Unamortized discounts and premiums are amortized over the term of the related debt.

 

      
 Carrying   
millionsValue Description
Balance at December 31, 2010$12,787  
 Issuances 494 WES 5.375% Senior Notes due 2021
 Borrowings 570 WES revolving credit facility
   2,500 $5.0 billion Facility
 Repayments (869) WES revolving credit facility and WES term loan
   (285) 6.875% Senior Notes due 2011
 Other, net 33 Changes in debt premium or discount
Balance at December 31, 2011$15,230  
 Issuances 674 WES 4.000% Senior Notes due 2022
 Borrowings 374 WES revolving credit facility
 Repayments (131) 6.125% Senior Notes due 2012
   (39) 5.000% Senior Notes due 2012
   (374) WES revolving credit facility
   (2,500) $5.0 billion Facility
 Other, net 35 Changes in debt premium or discount
Balance at December 31, 2012$13,269  
      
Scheduled Maturities Table
   
   
 Principal
 Amount of
millionsDebt Maturities
2013$ —
2014 775
2015  —
2016 1,750
2017 2,000
   
   
Interest Expense Table
          
millions 2012 2011 2010
Current debt, long-term debt, and other $963 $986 $871
(Gain) loss on early debt retirements and commitment termination (1)   —   —  112
Capitalized interest  (221)  (147)  (128)
Interest expense $742 $839 $855
          

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(1)        Loss on early debt retirements in 2010 is the result of repurchasing $1.4 billion aggregate principal amount of debt due 2011 and 2012.