Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 1,973	$ 1,937
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation, depletion, and amortization	1,197	991
Loss contingency for Macondo well incident	300	0
Loss from discontinued operations, net	22	166
Other changes:
Inventories	(968)	(468)
Receivables	(776)	(988)
Accounts payable	297	598
Other	(132)	130
Total cash flows from operating activities	1,913	2,366
Cash flows from investing activities:
Capital expenditures	(2,519)	(2,164)
Sales of investment securities	250	751
Purchases of investment securities	(171)	(501)
Other investing activities	(18)	36
Total cash flows from investing activities	(2,458)	(1,878)
Cash flows from financing activities:
Dividends to shareholders	(250)	(247)
Other financing activities	132	159
Total cash flows from financing activities	(118)	(88)
Effect of exchange rate changes on cash	(3)	(23)
Increase (decrease) in cash and equivalents	(666)	377
Cash and equivalents at beginning of period	2,698	1,398
Cash and equivalents at end of period	2,032	1,775
Cash payments during the period for:
Interest	269	260
Income taxes	$ 1,032	$ 871