Commitments and Contingencies (Unaudited) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	$ 600	$ 614
Loss Contingency, Range of Possible Loss, Portion Not Accrued	366	346
Recorded Third-Party Environmental Recoveries, Amount	514	$ 529
Financial Arrangements
Standby Unused Letters Of Credit and bank guarantees	476
Surety Bond Outstanding	$ 69
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
Line of Credit Outstanding	0
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Commercial Paper, Maximum Borrowing Capacity	2,000
Commercial Paper	0
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	235
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	365
Other Current Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount	205
Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount	$ 309