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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 1,947 $ 1,353 $ 5,631 $ 3,907
Net actuarial losses of defined benefit plans:        
Adjustments, net of tax effect of ($1) and $3; ($8) and $4 3 (7) 24 (8)
Recognized within net income, net of tax effect of ($2) and ($2); ($7) and ($7) 8 7 24 21
Prior service credit of defined benefit plans:        
Recognized within net income, net of tax effect of $0 and $0; $0 and $0 (1) (1) (1) (1)
Other comprehensive income (loss), net of taxes 10 (1) 47 12
Total comprehensive income $ 1,957 $ 1,352 $ 5,678 $ 3,919