Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOW FROM OPERATING ACTIVITIES
Net income (loss)	$ (14,831)	$ (522)	$ 4,131
Adjustments to reconcile net income (loss) to net cash from operating activities:
Discontinued operations, net	1,298	15	0
Depreciation, depletion and amortization of assets	8,097	6,140	3,977
Deferred income tax (benefit) provision	(2,517)	(1,027)	371
Other noncash charges to income	419	958	34
Asset impairments and other charges	11,002	1,328	561
(Gain) loss on sales of equity investments and other assets, net	1,666	(622)	(974)
Undistributed earnings from affiliates	(61)	(50)	(43)
Dry hole expense	47	89	56
Changes in operating assets and liabilities:
Decrease in receivables	2,062	401	955
(Increase) decrease in inventories	(484)	78	(108)
Decrease in other current assets	350	170	94
Increase (decrease) in accounts payable and accrued liabilities	(3,228)	358	(1,500)
Increase in current domestic and foreign income taxes	22	20	38
Other operating, net	0	0	77
Operating cash flow from continuing operations	3,842	7,336	7,669
Operating cash flow from discontinued operations, net of taxes	113	39	0
Net cash provided by operating activities	3,955	7,375	7,669
CASH FLOW FROM INVESTING ACTIVITIES
Capital expenditures	(2,535)	(6,367)	(4,975)
Change in capital accrual	(519)	(249)	55
Purchase of businesses and assets, net	(114)	(28,088)	(928)
Proceeds from sale of assets and equity investments, net	2,281	6,143	2,824
Equity investments and other, net	109	(291)	(182)
Investing cash flow from continuing operations	(778)	(28,852)	(3,206)
Investing cash flow from discontinued operations	(41)	(175)	0
Net cash used by investing activities	(819)	(29,027)	(3,206)
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from issuance of common and preferred stock	134	10,028	33
Purchases of treasury stock	(12)	(237)	(1,248)
Cash dividends paid on common and preferred stock	(1,845)	(2,624)	(2,374)
Distributions to noncontrolling interest	0	(257)	0
Payment of liabilities associated with the sale of future royalties	(386)	(28)	0
Other financing, net	(419)	257	9
Financing cash flow from continuing operations	(4,508)	22,196	(3,102)
Financing cash flow from discontinued operations	(8)	(3)	0
Net cash provided (used) by financing activities	(4,516)	22,193	(3,102)
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents	(1,380)	541	1,361
Cash, cash equivalents, restricted cash and restricted cash equivalents — beginning of year	3,574	3,033	1,672
Cash, cash equivalents, restricted cash and restricted cash equivalents — end of year	2,194	3,574	3,033
Occidental
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from long-term debt, net	6,936	21,557	978
Payments of long-term debt, net	(8,916)	(6,959)	(500)
WES
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from long-term debt, net	$ 0	$ 459	$ 0