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Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of operating segments | Segment 4    
Revenue $ 37,925 $ 39,350 $ 36,193
Earnings from continuing operations before income tax $ 3,738 $ 4,202 [1] $ 4,085 [1]
Long-lived assets of non-U.S. operations percent of total 4.00% 4.00% 3.00%
International Operations      
Segment Reporting Information [Line Items]      
Revenue $ 4,300 $ 4,400 $ 4,200
Earnings from continuing operations before income tax $ 585 $ 600 578
CSRA      
Segment Reporting Information [Line Items]      
One-time charges associated with costs to complete acquisition     $ 45
[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.