Commitments and Contingencies (Details 1) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Amounts accrued for probable environmental remediation costs	$ 614	$ 531
Loss Contingency, Range of Possible Loss, Portion Not Accrued	346	448
Recorded Third-Party Environmental Recoveries, Amount	529	$ 436
Financial Arrangements (Amounts in Paragraph)
Unused standby letters of credit and bank guarantees	456
Surety Bond Outstanding	94
Other Current Liabilities [Member]
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Amounts accrued for probable environmental remediation costs	237
Other Noncurrent Liabilities [Member]
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Amounts accrued for probable environmental remediation costs	377
Prepaid Expenses and Other Current Assets [Member]
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Recorded Third-Party Environmental Recoveries, Amount	210
Other Noncurrent Assets [Member]
Environmental Commitments and Contingencies (Amounts in Paragraphs)
Recorded Third-Party Environmental Recoveries, Amount	$ 319