Reconciliation of assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Reconciliation of Assets
Assets	$ 81,697	$ 78,324
Intersegment Eliminations
Reconciliation of Assets
Inventory Methodology Difference	(2,707)	(2,536)
Intersegment Eliminations | Cash and Short Term Investments
Reconciliation of Assets
Assets	10,028	8,822
Intersegment Eliminations | Deferred Income Taxes
Reconciliation of Assets
Assets	1,352	1,413
Intersegment Eliminations | Goodwill and Intangible Assets
Reconciliation of Assets
Assets	4,924	4,847
Intersegment Eliminations | Property Plant and Equipment-Net and Other Assets
Reconciliation of Assets
Assets	3,110	2,833
Intersegment Eliminations | Liabilities Included in Segment Assets
Reconciliation of Assets
Assets	9,387	8,466
Intersegment Eliminations | Other
Reconciliation of Assets
Assets	(356)	(392)
Operating Segments | Reportable Segments
Reconciliation of Assets
Assets	54,376	53,154
Operating Segments | Reportable Segments | Construction Industries
Reconciliation of Assets
Assets	4,416	4,259
Operating Segments | Reportable Segments | Resource Industries
Reconciliation of Assets
Assets	5,848	6,035
Operating Segments | Reportable Segments | Energy & Transportation
Reconciliation of Assets
Assets	9,179	8,582
Operating Segments | Reportable Segments | Financial Products Segment
Reconciliation of Assets
Assets	34,933	34,278
Operating Segments | All Other operating segments
Reconciliation of Assets
Assets	$ 1,583	$ 1,717