Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 632	$ 1,369
Adjustments to reconcile net income to net cash flows from operating activities:
Loss contingency for Macondo well incident	1,000	300
Depreciation, depletion, and amortization	922	791
Other changes:
Receivables	(613)	(602)
Payment of Barracuda-Caratinga obligation	(219)	0
Accounts payable	227	289
Inventories	(154)	(724)
Other	324	288
Total cash flows from operating activities	1,471	1,135
Cash flows from investing activities:
Capital expenditures	(1,396)	(1,651)
Sales of investment securities	232	200
Purchases of investment securities	(110)	(100)
Other investing activities	83	34
Total cash flows from investing activities	(1,191)	(1,517)
Cash flows from financing activities:
Payments to reacquire common stock	(1,015)	0
Dividends to shareholders	(231)	(167)
Other financing activities	(83)	25
Total cash flows from financing activities	(1,329)	(142)
Effect of exchange rate changes on cash	(23)	(2)
Increase (decrease) in cash and equivalents	(1,072)	(526)
Cash and equivalents at beginning of period	2,484	2,698
Cash and equivalents at end of period	1,412	2,172
Cash payments during the period for:
Interest	146	146
Income taxes	$ 390	$ 897