v2.4.0.6
Long-Term Debt (Condensed Consolidated Statement Of Cash Flows) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash provided by/(used in) operating activities $ 55,345 $ 48,413 $ 28,438
Additions to property, plant and equipment (30,975) (26,871) (22,491)
Proceeds associated with sales of long-term assets 11,133 3,261 1,545
Decrease/(increase) in restricted cash and cash equivalents 224 (628)  
All other investing, net (2,547) 34 (1,473)
Net cash provided by/(used in) investing activities (22,165) (24,204) (22,419)
Additions to short- and long-term debt 1,765 1,741 1,561
Reductions in short- and long-term debt (1,369) (8,660) (1,643)
Additions/(reductions) in debt with three months or less maturity 1,561 709 (71)
Cash dividends to ExxonMobil shareholders (9,020) (8,498) (8,023)
Common stock acquired (22,055) (13,093) (19,703)
All other financing, net 862 877 596
Net cash provided by/(used in) financing activities (28,256) (26,924) (27,283)
Effects of exchange rate changes on cash (85) (153) 520
Increase/(decrease) in cash and cash equivalents 4,839 (2,868) (20,744)
Exxon Mobil Corporation Parent Guarantor [Member]
      
Cash provided by/(used in) operating activities 37,752 35,740 27,424
Additions to property, plant and equipment (2,516) (2,922) (2,686)
Proceeds associated with sales of long-term assets 667 1,484 228
Decrease/(increase) in restricted cash and cash equivalents 132 (371)  
Net intercompany investing (4,227) (13,966) (1,826)
All other investing, net (1,679) (672)  
Net cash provided by/(used in) investing activities (7,623) (16,447) (4,284)
Additions to short- and long-term debt       
Reductions in short- and long-term debt (2) (3) (3)
Additions/(reductions) in debt with three months or less maturity 809 997 39
Cash dividends to ExxonMobil shareholders (9,020) (8,498) (8,023)
Common stock acquired (22,055) (13,093) (19,703)
All other financing, net 1,184 1,164 988
Net cash provided by/(used in) financing activities (29,084) (19,433) (26,702)
Increase/(decrease) in cash and cash equivalents 1,045 (140) (3,562)
SeaRiver Maritime Financial Holdings, Inc. [Member]
      
Cash provided by/(used in) operating activities 63 63 72
Net intercompany investing (229) (200) (209)
Net cash provided by/(used in) investing activities (229) (200) (209)
Reductions in short- and long-term debt (13) (13) (13)
Net intercompany financing activity 4    
All other financing, net 175 150 150
Net cash provided by/(used in) financing activities 166 137 137
All Other Subsidiaries [Member]
      
Cash provided by/(used in) operating activities 47,683 18,307 28,024
Additions to property, plant and equipment (28,459) (23,949) (19,805)
Proceeds associated with sales of long-term assets 10,466 1,777 1,317
Decrease/(increase) in restricted cash and cash equivalents 92 (257)  
Net intercompany investing 4,015 13,813 1,717
All other investing, net (868) 706 (1,473)
Net cash provided by/(used in) investing activities (14,754) (7,910) (18,244)
Additions to short- and long-term debt 1,765 1,741 1,561
Reductions in short- and long-term debt (1,354) (8,644) (1,627)
Additions/(reductions) in debt with three months or less maturity 752 (288) (110)
Cash dividends to ExxonMobil shareholders (30,153) (5,697) (27,082)
Net intercompany financing activity 262 202 168
All other financing, net (322) (286) (392)
Net cash provided by/(used in) financing activities (29,050) (12,972) (27,482)
Effects of exchange rate changes on cash (85) (153) 520
Increase/(decrease) in cash and cash equivalents 3,794 (2,728) (17,182)
Consolidating And Eliminating Adjustments [Member]
      
Cash provided by/(used in) operating activities (30,153) (5,697) (27,082)
Net intercompany investing 441 353 318
Net cash provided by/(used in) investing activities 441 353 318
Cash dividends to ExxonMobil shareholders 30,153 5,697 27,082
Net intercompany financing activity (266) (202) (168)
All other financing, net (175) (151) (150)
Net cash provided by/(used in) financing activities $ 29,712 $ 5,344 $ 26,764