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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,753	$ 1,174
Net actuarial losses of defined benefit plans:
Adjustments, net of tax effect of ($2) and ($3)	5	9
Recognized within net income, net of tax effect of ($3) and ($2)	8	8
Available-for-sale investments:
Unrealized gains, net of tax effect of $0 and $0	0	2
Other comprehensive income (loss), net of taxes	13	19
Total comprehensive income	$ 1,766	$ 1,193

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