Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Pretax Amounts Included in Accumulated OCI (Details)

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Employee Benefit Plans - Pretax Amounts Included in Accumulated OCI (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) $ 4,830 $ 5,593
Prior service cost (credits) 14 14
Amounts recognized in accumulated OCI 4,844 5,607
U.S. | Postretirement Health and Life Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 4 66
Prior service cost (credits) (3) (4)
Amounts recognized in accumulated OCI 1 62
Non-U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 456 628
Prior service cost (credits) 17 18
Amounts recognized in accumulated OCI 473 646
Qualified | U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 3,425 3,912
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI 3,425 3,912
Nonqualified | U.S. | Other Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 945 987
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI $ 945 $ 987