FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Derivatives: [Abstract]
Derivative Asset, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Derivatives:c
Derivative Liability, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Derivatives:c
NAV
Assets [Abstract]
Investments, Fair Value Disclosure	$ 29	$ 27
Trust Assets Fair Value Disclosure	71	66
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Long-term debt, including current portion	0	0
Level 1
Assets [Abstract]
Investments, Fair Value Disclosure	36	9
Trust Assets Fair Value Disclosure	22	19
Derivatives:
Derivative Asset	50	4
Derivatives: [Abstract]
Derivative Liability	11	18
Long-term debt, including current portion	0	0
Level 2
Assets [Abstract]
Investments, Fair Value Disclosure	0	0
Trust Assets Fair Value Disclosure	139	132
Derivatives:
Derivative Asset	239	16
Derivatives: [Abstract]
Derivative Liability	96	71
Long-term debt, including current portion	9,493	8,807
Level 3
Assets [Abstract]
Investments, Fair Value Disclosure	0	0
Trust Assets Fair Value Disclosure	0	0
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Long-term debt, including current portion	0	0
Carrying Amount
Assets [Abstract]
Investments, Fair Value Disclosure	65	36
Trust Assets Fair Value Disclosure	232	217
Derivatives:
Derivative Asset	289	20
Derivatives: [Abstract]
Derivative Liability	107	89
Long-term debt, including current portion	9,379	8,948
Estimate of Fair Value Measurement
Assets [Abstract]
Investments, Fair Value Disclosure	65	36
Trust Assets Fair Value Disclosure	232	217
Derivatives:
Derivative Asset	289	20
Derivatives: [Abstract]
Derivative Liability	107	89
Long-term debt, including current portion	9,493	8,807
Embedded Derivative Financial Instruments | NAV
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Embedded Derivative Financial Instruments | Level 1
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Embedded Derivative Financial Instruments | Level 2
Derivatives:
Derivative Asset	217	10
Derivatives: [Abstract]
Derivative Liability	84	60
Embedded Derivative Financial Instruments | Level 3
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Embedded Derivative Financial Instruments | Carrying Amount
Derivatives:
Derivative Asset	217	10
Derivatives: [Abstract]
Derivative Liability	84	60
Embedded Derivative Financial Instruments | Estimate of Fair Value Measurement
Derivatives:
Derivative Asset	217	10
Derivatives: [Abstract]
Derivative Liability	84	60
Future | NAV
Derivatives:
Derivative Asset	0
Derivatives: [Abstract]
Derivative Liability		0
Future | Level 1
Derivatives:
Derivative Asset	50
Derivatives: [Abstract]
Derivative Liability		17
Future | Level 2
Derivatives:
Derivative Asset	22
Derivatives: [Abstract]
Derivative Liability		11
Future | Level 3
Derivatives:
Derivative Asset	0
Derivatives: [Abstract]
Derivative Liability		0
Future | Carrying Amount
Derivatives:
Derivative Asset	72
Derivatives: [Abstract]
Derivative Liability		28
Future | Estimate of Fair Value Measurement
Derivatives:
Derivative Asset	72
Derivatives: [Abstract]
Derivative Liability		28
Commodity Contract | NAV
Derivatives:
Derivative Asset		0
Derivatives: [Abstract]
Derivative Liability	0	0
Commodity Contract | Level 1
Derivatives:
Derivative Asset		4
Derivatives: [Abstract]
Derivative Liability	11	1
Commodity Contract | Level 2
Derivatives:
Derivative Asset		6
Derivatives: [Abstract]
Derivative Liability	12	0
Commodity Contract | Level 3
Derivatives:
Derivative Asset		0
Derivatives: [Abstract]
Derivative Liability	0	0
Commodity Contract | Carrying Amount
Derivatives:
Derivative Asset		10
Derivatives: [Abstract]
Derivative Liability	23	1
Commodity Contract | Estimate of Fair Value Measurement
Derivatives:
Derivative Asset		10
Derivatives: [Abstract]
Derivative Liability	23	1
Equity securities | NAV
Assets [Abstract]
Marketable Securities	0	0
Equity securities | Level 1
Assets [Abstract]
Marketable Securities	36	9
Equity securities | Level 2
Assets [Abstract]
Marketable Securities	0	0
Equity securities | Level 3
Assets [Abstract]
Marketable Securities	0	0
Equity securities | Carrying Amount
Assets [Abstract]
Marketable Securities	36	9
Equity securities | Estimate of Fair Value Measurement
Assets [Abstract]
Marketable Securities	36	9
U.S. core fixed income fund | NAV
Assets [Abstract]
Marketable Securities	29	27
Trust Assets Fair Value Disclosure	71	66
U.S. core fixed income fund | Level 1
Assets [Abstract]
Marketable Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund | Level 2
Assets [Abstract]
Marketable Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund | Level 3
Assets [Abstract]
Marketable Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund | Carrying Amount
Assets [Abstract]
Marketable Securities	29	27
Trust Assets Fair Value Disclosure	71	66
U.S. core fixed income fund | Estimate of Fair Value Measurement
Assets [Abstract]
Marketable Securities	29	27
Trust Assets Fair Value Disclosure	71	66
Government mortgage-backed securities | NAV
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	56	54
Government mortgage-backed securities | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities | Carrying Amount
Assets [Abstract]
Trust Assets Fair Value Disclosure	56	54
Government mortgage-backed securities | Estimate of Fair Value Measurement
Assets [Abstract]
Trust Assets Fair Value Disclosure	56	54
Government bonds | NAV
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government bonds | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government bonds | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	37	34
Government bonds | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government bonds | Carrying Amount
Assets [Abstract]
Trust Assets Fair Value Disclosure	37	34
Government bonds | Estimate of Fair Value Measurement
Assets [Abstract]
Trust Assets Fair Value Disclosure	37	34
Corporate bonds | NAV
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Corporate bonds | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Corporate bonds | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	34	31
Corporate bonds | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Corporate bonds | Carrying Amount
Assets [Abstract]
Trust Assets Fair Value Disclosure	34	31
Corporate bonds | Estimate of Fair Value Measurement
Assets [Abstract]
Trust Assets Fair Value Disclosure	34	31
Money market funds | NAV
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Money market funds | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	22	19
Money market funds | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Money market funds | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Money market funds | Carrying Amount
Assets [Abstract]
Trust Assets Fair Value Disclosure	22	19
Money market funds | Estimate of Fair Value Measurement
Assets [Abstract]
Trust Assets Fair Value Disclosure	22	19
Asset-backed securities | NAV
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	11	12
Asset-backed securities | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities | Carrying Amount
Assets [Abstract]
Trust Assets Fair Value Disclosure	11	12
Asset-backed securities | Estimate of Fair Value Measurement
Assets [Abstract]
Trust Assets Fair Value Disclosure	11	12
Collateralized mortgage-backed securities | NAV
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Collateralized mortgage-backed securities | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Collateralized mortgage-backed securities | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	1	1
Collateralized mortgage-backed securities | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Collateralized mortgage-backed securities | Carrying Amount
Assets [Abstract]
Trust Assets Fair Value Disclosure	1	1
Collateralized mortgage-backed securities | Estimate of Fair Value Measurement
Assets [Abstract]
Trust Assets Fair Value Disclosure	$ 1	$ 1