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, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) $ 5,593 $ 5,480
Prior service cost (credits) 14 12
Amounts recognized in accumulated OCI 5,607 5,492
U.S. | Postretirement Health and Life Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 66 48
Prior service cost (credits) (4) (6)
Amounts recognized in accumulated OCI 62 42
Non-U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 628 559
Prior service cost (credits) 18 18
Amounts recognized in accumulated OCI 646 577
Qualified | U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 3,912 3,865
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI 3,912 3,865
Nonqualified | U.S. | Other Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 987 1,008
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI $ 987 $ 1,008