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Consolidated Statements Of Cash Flows (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net earnings $ 870 $ 3,159
Loss (earnings) from discontinued operations, net of tax 21 (2,586)
Adjustments to reconcile earnings from continuing operations to net cash from operating activities:    
Depreciation, depletion and amortization 1,364 1,056
Deferred income tax expense 405 1,438
Unrealized change in fair value of financial instruments (362) (74)
Other noncash charges 114 82
Net decrease (increase) in working capital 22 (89)
Decrease in long-term other assets 3 45
Decrease in long-term other liabilities (11) (201)
Cash from operating activities - continuing operations 2,426 2,830
Cash from operating activities - discontinued operations 26 (20)
Net cash from operating activities 2,452 2,810
Cash flows from investing activities:    
Capital expenditures (4,267) (3,720)
Purchases of short-term investments (1,471) (4,520)
Redemptions of short-term investments 2,030 1,298
Proceeds from property and equipment divestitures 864 5
Other 14 (32)
Cash from investing activities - continuing operations (2,830) (6,969)
Cash from investing activities - discontinued operations 58 3,170
Net cash from investing activities (2,772) (3,799)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt, net of issuance costs 2,465  
Net short-term (repayments) borrowings (1,498) 2,340
Credit facility borrowings 750  
Credit facility repayments (750)  
Proceeds from stock option exercises 22 96
Repurchases of common stock   (1,290)
Dividends paid on common stock (162) (140)
Excess tax benefits related to share-based compensation 1 12
Net cash from financing activities 828 1,018
Effect of exchange rate changes on cash 38 32
Net increase in cash and cash equivalents 546 61
Cash and cash equivalents at beginning of period 5,555 3,290
Cash and cash equivalents at end of period $ 6,101 $ 3,351