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Inventory (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Work in process $ 3,990 $ 4,419
Raw materials 1,712 1,733
Finished goods 30 30
Pre-owned aircraft 13 124
Total inventories $ 5,745 $ 6,306 [1]
[1] *Prior-period information has been restated for the retrospective application of a change in accounting principle related to the amortization of actuarial gains and losses for our qualified U.S. government pension plans, which we adopted in the fourth quarter of 2020. For further discussion of this change in accounting principle, see Note T to the Consolidated Financial Statements.