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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net Income $ 2,232 $ 5,145 $ 5,152 $ 10,904
Defined benefit plans        
Reclassification adjustment for amortization of prior service credit included in net income (10) (10) (19) (20)
Net change (10) (10) (19) (20)
Net actuarial loss arising during the period 0 (82) 0 (82)
Reclassification adjustment for amortization of net actuarial losses included in net income 19 25 42 41
Net change 19 (57) 42 (41)
Income taxes on defined benefit plans (3) 14 (6) 12
Defined benefit plans, net of tax 6 (53) 17 (49)
Unrealized holding gain (loss) on securities (3) (5) 3 (9)
Reclassification adjustment for gain included in net income (1) 0 (2) 0
Income taxes on unrealized holding gain (loss) on securities 1 1 0 2
Unrealized holding gain (loss) on securities, net of tax (3) (4) 1 (7)
Foreign currency translation adjustments, net of tax 99 (448) 57 (307)
Other Comprehensive Income (Loss), Net of Tax 102 (505) 75 (363)
Comprehensive Income $ 2,334 $ 4,640 $ 5,227 $ 10,541