Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 1,340	$ 1,973
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation, depletion, and amortization	1,403	1,197
Loss contingency for Macondo well incident	1,000	300
Other changes:
Receivables	(856)	(776)
Accounts payable	243	297
Payment of Barracuda-Caratinga obligation	(219)	0
Inventories	(210)	(968)
Other	(152)	(110)
Total cash flows from operating activities	2,549	1,913
Cash flows from investing activities:
Capital expenditures	(2,075)	(2,519)
Sales of investment securities	294	250
Purchases of investment securities	(168)	(171)
Other investing activities	82	(18)
Total cash flows from investing activities	(1,867)	(2,458)
Cash flows from financing activities:
Payments to reacquire common stock	(4,356)	0
Proceeds from long-term borrowings, net of offering costs	2,968	0
Dividends to shareholders	(337)	(250)
Other financing activities	58	132
Total cash flows from financing activities	(1,667)	(118)
Effect of exchange rate changes on cash	(8)	(3)
Increase (decrease) in cash and equivalents	(993)	(666)
Cash and equivalents at beginning of period	2,484	2,698
Cash and equivalents at end of period	1,491	2,032
Cash payments during the period for:
Interest	269	269
Income taxes	$ 566	$ 1,032