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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 1,931 $ 1,380 $ 3,684 $ 2,554
Net actuarial losses of defined benefit plans:        
Adjustments, net of tax effect of ($5) and $4; ($7) and $1 16 (10) 21 (1)
Recognized within net income, net of tax effect of ($2) and ($3); ($5) and ($5) 8 6 16 14
Available-for-sale investments:        
Unrealized losses, net of tax effect of $0 and $0; $0 and $0 0 (2) 0 0
Other comprehensive income (loss), net of taxes 24 (6) 37 13
Total comprehensive income $ 1,955 $ 1,374 $ 3,721 $ 2,567