Reconciliation of assets (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Reconciliation of Assets
Assets	$ 80,729	$ 78,324
Intersegment Eliminations
Reconciliation of Assets
Inventory Methodology Difference	(2,694)	(2,536)
Intersegment Eliminations | Cash and Short Term Investments
Reconciliation of Assets
Assets	10,492	8,822
Intersegment Eliminations | Deferred Income Taxes
Reconciliation of Assets
Assets	1,288	1,413
Intersegment Eliminations | Goodwill and Intangible Assets
Reconciliation of Assets
Assets	4,904	4,847
Intersegment Eliminations | Property Plant and Equipment-Net and Other Assets
Reconciliation of Assets
Assets	2,783	2,833
Intersegment Eliminations | Liabilities Included in Segment Assets
Reconciliation of Assets
Assets	9,113	8,466
Intersegment Eliminations | Other
Reconciliation of Assets
Assets	(478)	(392)
Operating Segments | Reportable Segments
Reconciliation of Assets
Assets	53,688	53,154
Operating Segments | Reportable Segments | Construction Industries
Reconciliation of Assets
Assets	4,099	4,259
Operating Segments | Reportable Segments | Resource Industries
Reconciliation of Assets
Assets	6,043	6,035
Operating Segments | Reportable Segments | Energy & Transportation
Reconciliation of Assets
Assets	9,123	8,582
Operating Segments | Reportable Segments | Financial Products Segment
Reconciliation of Assets
Assets	34,423	34,278
Operating Segments | All Other operating segments
Reconciliation of Assets
Assets	$ 1,633	$ 1,717