Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Components of accumulated other comprehensive loss
Beginning balance	$ 3,887	$ 1,534
Reclassifications into earnings (net of tax effect)	122	156
Ending balance	3,811	1,281
Reclassifications into earnings, tax effect	(37)	(47)
Accumulated Other Comprehensive Income
Components of accumulated other comprehensive loss
Beginning balance	(7,130)	(9,038)
Ending balance	(7,008)	(8,882)
AOCI tax	(1,147)	(1,717)	$ (1,184)	$ (1,764)
Pension and Other Benefit Liabilities
Components of accumulated other comprehensive loss
Beginning balance	(7,170)	(9,078)
Reclassifications into earnings (net of tax effect)	122	156
Ending balance	(7,048)	(8,922)
Other
Components of accumulated other comprehensive loss
Beginning balance	40	40
Reclassifications into earnings (net of tax effect)	0	0
Ending balance	$ 40	$ 40