Commitments and Contingencies (Unaudited) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	$ 621,000,000	$ 614,000,000
Loss Contingency, Range of Possible Loss, Portion Not Accrued	342,000,000	346,000,000
Recorded Third-Party Environmental Recoveries, Amount	534,000,000	$ 529,000,000
Financial Arrangements
Standby Unused Letters Of Credit and bank guarantees	480,000,000
Surety Bond Outstanding	$ 80,000,000
Line of Credit Facility [Line Items]
Debt Instrument, Covenant Compliance	the company was in compliance with all covenants under its credit agreements.
Five Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000.0
Line of Credit Outstanding	0
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Commercial Paper, Maximum Borrowing Capacity	2,000,000,000.0
Commercial Paper	0
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	246,000,000
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	375,000,000
Other Current Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount	218,000,000
Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount	$ 316,000,000