Fair Value Measurement - Fair Value Measurement Inputs (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivatives:
Derivative Asset	$ 110	$ 20
Derivatives: [Abstract]
Derivative Liability	11	89
Restricted cash and cash equivalents	460	888
Designated For Export Proceeds
Derivatives: [Abstract]
Restricted cash and cash equivalents	300	700
Talc-Related Litigation
Derivatives: [Abstract]
Restricted cash and cash equivalents	200
Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Investments, Fair Value Disclosure	28	27
Trust Assets Fair Value Disclosure	68	66
Derivatives:
Derivative Asset	0	0
Discontinued Operation, Contingent Receivable	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Long-term debt, including current portion	0	0
Level 1
Investment securities (current and long-term):
Investments, Fair Value Disclosure	13	9
Trust Assets Fair Value Disclosure	22	19
Derivatives:
Derivative Asset	38	4
Discontinued Operation, Contingent Receivable	0	0
Derivatives: [Abstract]
Derivative Liability	0	18
Long-term debt, including current portion	0	0
Level 2
Investment securities (current and long-term):
Investments, Fair Value Disclosure	0	0
Trust Assets Fair Value Disclosure	132	132
Derivatives:
Derivative Asset	76	16
Discontinued Operation, Contingent Receivable	0	0
Derivatives: [Abstract]
Derivative Liability	15	71
Long-term debt, including current portion	9,320	8,807
Level 3
Investment securities (current and long-term):
Investments, Fair Value Disclosure	0	0
Trust Assets Fair Value Disclosure	0	0
Derivatives:
Derivative Asset	0	0
Discontinued Operation, Contingent Receivable	2	3
Derivatives: [Abstract]
Derivative Liability	0	0
Long-term debt, including current portion	0	0
Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Investments, Fair Value Disclosure	41	36
Trust Assets Fair Value Disclosure	222	217
Derivatives:
Derivative Asset	114	20
Discontinued Operation, Contingent Receivable	2	3
Derivatives: [Abstract]
Derivative Liability	15	89
Long-term debt, including current portion	9,404	8,948
Estimate of Fair Value Measurement
Investment securities (current and long-term):
Investments, Fair Value Disclosure	41	36
Trust Assets Fair Value Disclosure	222	217
Derivatives:
Derivative Asset	114	20
Discontinued Operation, Contingent Receivable	2	3
Derivatives: [Abstract]
Derivative Liability	15	89
Long-term debt, including current portion	9,320	8,807
Embedded Derivative Financial Instruments
Derivatives:
Derivative Asset	51	10
Derivatives: [Abstract]
Derivative Liability	8	60
Embedded Derivative Financial Instruments | Fair Value Measured at Net Asset Value Per Share
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	55	10
Derivatives: [Abstract]
Derivative Liability	12	60
Embedded Derivative Financial Instruments | Level 3
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Embedded Derivative Financial Instruments | Carrying Amount, Fair Value Disclosure
Derivatives:
Derivative Asset	55	10
Derivatives: [Abstract]
Derivative Liability	12	60
Embedded Derivative Financial Instruments | Estimate of Fair Value Measurement
Derivatives:
Derivative Asset	55	10
Derivatives: [Abstract]
Derivative Liability	12	60
Commodity Contract
Derivatives:
Derivative Asset	59	10
Derivatives: [Abstract]
Derivative Liability	3	29
Commodity Contract | Fair Value Measured at Net Asset Value Per Share
Derivatives:
Derivative Asset	0
Derivatives: [Abstract]
Derivative Liability	0	0
Commodity Contract | Level 1
Derivatives:
Derivative Asset	37
Derivatives: [Abstract]
Derivative Liability	0	17
Commodity Contract | Level 2
Derivatives:
Derivative Asset	19
Derivatives: [Abstract]
Derivative Liability	3	11
Commodity Contract | Level 3
Derivatives:
Derivative Asset	0
Derivatives: [Abstract]
Derivative Liability	0	0
Commodity Contract | Carrying Amount, Fair Value Disclosure
Derivatives:
Derivative Asset	56
Derivatives: [Abstract]
Derivative Liability	3	28
Commodity Contract | Estimate of Fair Value Measurement
Derivatives:
Derivative Asset	56
Derivatives: [Abstract]
Derivative Liability	3	28
Forward Contracts | Fair Value Measured at Net Asset Value Per Share
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability		0
Forward Contracts | Level 1
Derivatives:
Derivative Asset	1	4
Derivatives: [Abstract]
Derivative Liability		1
Forward Contracts | Level 2
Derivatives:
Derivative Asset	2	6
Derivatives: [Abstract]
Derivative Liability		0
Forward Contracts | Level 3
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability		0
Forward Contracts | Carrying Amount, Fair Value Disclosure
Derivatives:
Derivative Asset	3	10
Derivatives: [Abstract]
Derivative Liability		1
Forward Contracts | Estimate of Fair Value Measurement
Derivatives:
Derivative Asset	3	10
Derivatives: [Abstract]
Derivative Liability		1
U.S. core fixed income fund | Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Marketable Securities	28	27
Trust Assets Fair Value Disclosure	68	66
U.S. core fixed income fund | Level 1
Investment securities (current and long-term):
Marketable Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund | Level 2
Investment securities (current and long-term):
Marketable Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund | Level 3
Investment securities (current and long-term):
Marketable Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund | Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Marketable Securities	28	27
Trust Assets Fair Value Disclosure	68	66
U.S. core fixed income fund | Estimate of Fair Value Measurement
Investment securities (current and long-term):
Marketable Securities	28	27
Trust Assets Fair Value Disclosure	68	66
Equity securities | Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Marketable Securities	0	0
Equity securities | Level 1
Investment securities (current and long-term):
Marketable Securities	13	9
Equity securities | Level 2
Investment securities (current and long-term):
Marketable Securities	0	0
Equity securities | Level 3
Investment securities (current and long-term):
Marketable Securities	0	0
Equity securities | Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Marketable Securities	13	9
Equity securities | Estimate of Fair Value Measurement
Investment securities (current and long-term):
Marketable Securities	13	9
Government mortgage-backed securities | Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	52	54
Government mortgage-backed securities | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities | Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	52	54
Government mortgage-backed securities | Estimate of Fair Value Measurement
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	52	54
Corporate bonds | Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Corporate bonds | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Corporate bonds | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	34	31
Corporate bonds | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Corporate bonds | Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	34	31
Corporate bonds | Estimate of Fair Value Measurement
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	34	31
Government bonds | Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government bonds | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government bonds | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	31	34
Government bonds | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government bonds | Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	31	34
Government bonds | Estimate of Fair Value Measurement
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	31	34
Money market funds | Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Money market funds | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	22	19
Money market funds | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Money market funds | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Money market funds | Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	22	19
Money market funds | Estimate of Fair Value Measurement
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	22	19
Asset-backed securities | Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	14	12
Asset-backed securities | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities | Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	14	12
Asset-backed securities | Estimate of Fair Value Measurement
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	14	12
Collateralized Mortgage Backed Securities | Fair Value Measured at Net Asset Value Per Share
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Collateralized Mortgage Backed Securities | Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Collateralized Mortgage Backed Securities | Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	1	1
Collateralized Mortgage Backed Securities | Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Collateralized Mortgage Backed Securities | Carrying Amount, Fair Value Disclosure
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	1	1
Collateralized Mortgage Backed Securities | Estimate of Fair Value Measurement
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	$ 1	$ 1