Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 131,310	$ 83,402	$ 64,747
Operating Segments | North America
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	35,844	22,225	16,772
Operating Segments | International
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	18,014	10,429	7,754
Operating Segments | AWS
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	18,660	12,698	9,787
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 58,792	$ 38,050	$ 30,434