Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 1,369	$ 1,252
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation, depletion, and amortization	791	651
Loss contingency for Macondo well incident	300	0
Other changes:
Inventories	(724)	(290)
Receivables	(602)	(583)
Accounts payable	289	397
Other	(288)	(39)
Total cash flows from operating activities	1,135	1,388
Cash flows from investing activities:
Capital expenditures	(1,651)	(1,423)
Sales of marketable securities	200	701
Purchases of marketable securities	(100)	(501)
Other investing activities	34	(20)
Total cash flows from investing activities	(1,517)	(1,243)
Cash flows from financing activities:
Dividends to shareholders	(167)	(165)
Other financing activities	25	80
Total cash flows from financing activities	(142)	(85)
Effect of exchange rate changes on cash	(2)	(20)
Increase (decrease) in cash and equivalents	(526)	40
Cash and equivalents at beginning of period	2,698	1,398
Cash and equivalents at end of period	2,172	1,438
Cash payments during the period for:
Interest	146	136
Income taxes	$ 897	$ 536