v2.4.0.8
Condensed Consolidating Statements Of Cash Flows (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]    
Net Cash Provided By Operating Activities $ 2,643 $ 2,205
CASH FLOWS FROM INVESTING ACTIVITIES:    
Drilling and completion costs (1,996) (3,145)
Acquisitions of proved and unproved properties (356) (550)
Proceeds from divestitures of proved and unproved properties 248 1,895
Additions to other property and equipment (620) (506)
Other (3) 4
Net Cash Used In Investing Activities (1,780) (1,575)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from credit facilities borrowings 857 6,559
Payments on credit facilities borrowings (1,239) (6,578)
Proceeds from issuance of senior notes, net of discount and offering costs 3,460  
Proceeds from issuance of oilfield services term loan, net of issuance costs 394 0
Cash paid to purchase debt (3,362) (1,874)
Proceeds from sales of noncontrolling interests 0 5
Other 0 (43)
Intercompany advances, net 0  
Net Cash Used In Financing Activities (238) (240)
Net increase (decrease) in cash and cash equivalents 625 390
Cash and cash equivalents, beginning of period 837 287
Cash and cash equivalents, end of period 1,462 677
Parent Company Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net Cash Provided By Operating Activities 0 0
CASH FLOWS FROM INVESTING ACTIVITIES:    
Drilling and completion costs 0 0
Acquisitions of proved and unproved properties 0 0
Proceeds from divestitures of proved and unproved properties 0 0
Additions to other property and equipment 0 0
Other 0 0
Net Cash Used In Investing Activities 0 0
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from credit facilities borrowings 0 0
Payments on credit facilities borrowings 0 0
Proceeds from issuance of senior notes, net of discount and offering costs 2,966 2,274
Proceeds from issuance of oilfield services term loan, net of issuance costs 0  
Cash paid to purchase debt (3,362) (1,874)
Proceeds from sales of noncontrolling interests   0
Other (193) (245)
Intercompany advances, net 1,161 272
Net Cash Used In Financing Activities 572 427
Net increase (decrease) in cash and cash equivalents 572 427
Cash and cash equivalents, beginning of period 799 228
Cash and cash equivalents, end of period 1,371 655
Guarantor Subsidiaries [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net Cash Provided By Operating Activities 2,134 1,933
CASH FLOWS FROM INVESTING ACTIVITIES:    
Drilling and completion costs (1,791) (2,689)
Acquisitions of proved and unproved properties (356) (549)
Proceeds from divestitures of proved and unproved properties 247 1,834
Additions to other property and equipment (368) (316)
Other 858 161
Net Cash Used In Investing Activities (1,410) (1,559)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from credit facilities borrowings 140 6,013
Payments on credit facilities borrowings (140) (6,013)
Proceeds from issuance of senior notes, net of discount and offering costs 0 0
Proceeds from issuance of oilfield services term loan, net of issuance costs 0  
Cash paid to purchase debt 0 0
Proceeds from sales of noncontrolling interests   5
Other 15 (292)
Intercompany advances, net (739) (87)
Net Cash Used In Financing Activities (724) (374)
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period 0 0
Non-Guarantor Subsidiaries [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net Cash Provided By Operating Activities 509 297
CASH FLOWS FROM INVESTING ACTIVITIES:    
Drilling and completion costs (205) (456)
Acquisitions of proved and unproved properties 0 (1)
Proceeds from divestitures of proved and unproved properties 1 61
Additions to other property and equipment (252) (190)
Other 60 440
Net Cash Used In Investing Activities (396) (146)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from credit facilities borrowings 717 546
Payments on credit facilities borrowings (1,099) (565)
Proceeds from issuance of senior notes, net of discount and offering costs 494 0
Proceeds from issuance of oilfield services term loan, net of issuance costs 394  
Cash paid to purchase debt 0 0
Proceeds from sales of noncontrolling interests   0
Other (119) 16
Intercompany advances, net (422) (185)
Net Cash Used In Financing Activities (35) (188)
Net increase (decrease) in cash and cash equivalents 78 (37)
Cash and cash equivalents, beginning of period 39 59
Cash and cash equivalents, end of period 117 22
Eliminations [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net Cash Provided By Operating Activities 0 (25)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Drilling and completion costs 0 0
Acquisitions of proved and unproved properties 0 0
Proceeds from divestitures of proved and unproved properties 0 0
Additions to other property and equipment 0 0
Other 26 130
Net Cash Used In Investing Activities 26 130
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from credit facilities borrowings 0 0
Payments on credit facilities borrowings 0 0
Proceeds from issuance of senior notes, net of discount and offering costs 0 0
Proceeds from issuance of oilfield services term loan, net of issuance costs 0  
Cash paid to purchase debt 0 0
Proceeds from sales of noncontrolling interests   0
Other (51) (105)
Intercompany advances, net 0 0
Net Cash Used In Financing Activities (51) (105)
Net increase (decrease) in cash and cash equivalents (25) 0
Cash and cash equivalents, beginning of period (1) 0
Cash and cash equivalents, end of period (26) 0
Consolidated Entities [Member]
    
CASH FLOWS FROM INVESTING ACTIVITIES:    
Other 944 731
CASH FLOWS FROM FINANCING ACTIVITIES:    
Other $ (348) $ (626)