LONG-TERM DEBT - SCHEDULE (Details) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
$ 35,200
|
|
| Long-term finance leases |
316
|
$ 347
|
| Current finance leases |
42
|
51
|
| Total debt and finance leases |
36,185
|
38,588
|
| Less current maturities of financing leases |
(42)
|
(51)
|
| Less current maturities of long-term debt |
(398)
|
0
|
| Long-term debt, net |
35,745
|
38,537
|
| Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
35,235
|
37,401
|
| Unamortized discount, net |
748
|
914
|
| Debt issuance costs |
(156)
|
(125)
|
| Long-term finance leases |
316
|
347
|
| Long-term debt, net |
$ 35,745
|
$ 38,537
|
| 4.850% senior notes due 2021 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.85%
|
4.85%
|
| Long-term debt, gross |
$ 147
|
$ 677
|
| 2.600% senior notes due 2021 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
2.60%
|
2.60%
|
| Long-term debt, gross |
$ 224
|
$ 1,500
|
| 4.100% senior note due 2021 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.10%
|
4.10%
|
| Long-term debt, gross |
$ 0
|
$ 1,249
|
| Variable rate bonds due 2021 | Variable rate bonds | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument, variable rate |
1.193%
|
2.854%
|
| Long-term debt, gross |
$ 27
|
$ 500
|
| Variable rate bonds due 2021, 3.151% | Variable rate bonds | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument, variable rate |
3.151%
|
3.151%
|
| Long-term debt, gross |
$ 0
|
$ 500
|
| 2-year variable rate Term Loan due 2021, 3.111% | Secured Debt | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument, variable rate |
3.111%
|
3.111%
|
| Debt instrument, term |
2 years
|
2 years
|
| Long-term debt, gross |
$ 0
|
$ 1,956
|
| 2.700% senior notes due 2022 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
2.70%
|
2.70%
|
| Long-term debt, gross |
$ 629
|
$ 2,000
|
| 3.125% senior notes due 2022 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
3.125%
|
3.125%
|
| Long-term debt, gross |
$ 276
|
$ 814
|
| 2.600% senior notes due 2022 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
2.60%
|
2.60%
|
| Long-term debt, gross |
$ 101
|
$ 400
|
| Variable rate bonds due 2022 | Variable rate bonds | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument, variable rate |
1.73%
|
3.36%
|
| Long-term debt, gross |
$ 1,052
|
$ 1,500
|
| 2.700% senior notes due 2023 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
2.70%
|
2.70%
|
| Long-term debt, gross |
$ 927
|
$ 1,191
|
| 8.750% medium-term notes due 2023 | Medium-term notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
8.75%
|
8.75%
|
| Long-term debt, gross |
$ 22
|
$ 22
|
| 2.900% senior notes due 2024 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
2.90%
|
2.90%
|
| Long-term debt, gross |
$ 3,000
|
$ 3,000
|
| 6.950% senior notes due 2024 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.95%
|
6.95%
|
| Long-term debt, gross |
$ 650
|
$ 650
|
| 3.450% senior notes due 2024 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
3.45%
|
3.45%
|
| Long-term debt, gross |
$ 248
|
$ 248
|
| 8.000% senior notes due 2025 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
8.00%
|
8.00%
|
| Long-term debt, gross |
$ 500
|
$ 0
|
| 5.875% senior notes due 2025 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
5.875%
|
5.875%
|
| Long-term debt, gross |
$ 900
|
$ 0
|
| 3.500% senior notes due 2025 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
3.50%
|
3.50%
|
| Long-term debt, gross |
$ 750
|
$ 750
|
| 5.500% senior notes due 2025 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
5.50%
|
5.50%
|
| Long-term debt, gross |
$ 750
|
$ 0
|
| 5.550% senior notes due 2026 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
5.55%
|
5.55%
|
| Long-term debt, gross |
$ 1,100
|
$ 1,100
|
| 3.200% senior notes due 2026 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
3.20%
|
3.20%
|
| Long-term debt, gross |
$ 1,000
|
$ 1,000
|
| 3.400% senior notes due 2026 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
3.40%
|
3.40%
|
| Long-term debt, gross |
$ 1,150
|
$ 1,150
|
| 7.500% debentures due 2026 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.50%
|
7.50%
|
| Long-term debt, gross |
$ 112
|
$ 112
|
| 8.500% senior notes due 2027 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
8.50%
|
8.50%
|
| Long-term debt, gross |
$ 500
|
$ 0
|
| 3.000% senior notes due 2027 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
3.00%
|
3.00%
|
| Long-term debt, gross |
$ 750
|
$ 750
|
| 7.125% debentures due 2027 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.125%
|
7.125%
|
| Long-term debt, gross |
$ 150
|
$ 150
|
| 7.000% debentures due 2027 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.00%
|
7.00%
|
| Long-term debt, gross |
$ 48
|
$ 48
|
| 6.625% debentures due 2028 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.625%
|
6.625%
|
| Long-term debt, gross |
$ 14
|
$ 14
|
| 7.150% debentures due 2028 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.15%
|
7.15%
|
| Long-term debt, gross |
$ 235
|
$ 235
|
| 7.200% senior debentures due 2028 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.20%
|
7.20%
|
| Long-term debt, gross |
$ 82
|
$ 82
|
| 6.375% senior notes due 2028 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.375%
|
6.375%
|
| Long-term debt, gross |
$ 600
|
$ 0
|
| 7.200% debentures due 2029 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.20%
|
7.20%
|
| Long-term debt, gross |
$ 135
|
$ 135
|
| 7.950% debentures due 2029 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.95%
|
7.95%
|
| Long-term debt, gross |
$ 116
|
$ 116
|
| 8.450% senior debentures due 2029 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
8.45%
|
8.45%
|
| Long-term debt, gross |
$ 116
|
$ 116
|
| 3.500% senior notes due 2029 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
3.50%
|
3.50%
|
| Long-term debt, gross |
$ 1,500
|
$ 1,500
|
| Variable rate bonds due 2030 | Variable rate bonds | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument, variable rate |
4.21%
|
1.705%
|
| Long-term debt, gross |
$ 68
|
$ 68
|
| 8.875% senior notes due 2030 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
8.875%
|
8.875%
|
| Long-term debt, gross |
$ 1,000
|
$ 0
|
| 6.625% senior notes due 2030 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.625%
|
6.625%
|
| Long-term debt, gross |
$ 1,500
|
$ 0
|
| 6.125% senior notes due 2031 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.125%
|
6.125%
|
| Long-term debt, gross |
$ 1,250
|
$ 0
|
| 7.500% senior notes due 2031 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.50%
|
7.50%
|
| Long-term debt, gross |
$ 900
|
$ 900
|
| 7.875% senior notes due 2031 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.875%
|
7.875%
|
| Long-term debt, gross |
$ 500
|
$ 500
|
| 6.450% senior notes due 2036 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.45%
|
6.45%
|
| Long-term debt, gross |
$ 1,750
|
$ 1,750
|
| Zero Coupon senior notes due 2036 | Senior notes |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
5.24%
|
|
| Zero Coupon senior notes due 2036 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Long-term debt, gross |
$ 2,269
|
$ 2,271
|
| 6.500% note payable to WES due 2038 | Note payable | WES |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.50%
|
6.50%
|
| Long-term debt, gross |
$ 0
|
$ 260
|
| 4.300% senior notes due 2039 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.30%
|
4.30%
|
| Long-term debt, gross |
$ 750
|
$ 750
|
| 7.950% senior notes due 2039 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.95%
|
7.95%
|
| Long-term debt, gross |
$ 325
|
$ 325
|
| 6.200% senior notes due 2040 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.20%
|
6.20%
|
| Long-term debt, gross |
$ 750
|
$ 750
|
| 4.500% senior notes due 2044 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.50%
|
4.50%
|
| Long-term debt, gross |
$ 625
|
$ 625
|
| 4.625% senior notes due 2045 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.625%
|
4.625%
|
| Long-term debt, gross |
$ 750
|
$ 750
|
| 6.600% senior notes due 2046 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
6.60%
|
6.60%
|
| Long-term debt, gross |
$ 1,100
|
$ 1,100
|
| 4.400% senior notes due 2046 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.40%
|
4.40%
|
| Long-term debt, gross |
$ 1,200
|
$ 1,200
|
| 4.100% senior notes due 2047 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.10%
|
4.10%
|
| Long-term debt, gross |
$ 750
|
$ 750
|
| 4.200% senior notes due 2048 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.20%
|
4.20%
|
| Long-term debt, gross |
$ 1,000
|
$ 1,000
|
| 4.400% senior notes due 2049 | Senior notes | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
4.40%
|
4.40%
|
| Long-term debt, gross |
$ 750
|
$ 750
|
| 7.730% debentures due 2096 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.73%
|
7.73%
|
| Long-term debt, gross |
$ 60
|
$ 60
|
| 7.500% debentures due 2096 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.50%
|
7.50%
|
| Long-term debt, gross |
$ 78
|
$ 78
|
| 7.250% debentures due 2096 | Debentures | Occidental |
|
|
| Debt Instrument [Line Items] |
|
|
| Debt instrument interest rate stated percentage |
7.25%
|
7.25%
|
| Long-term debt, gross |
$ 49
|
$ 49
|