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, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) $ 5,480 $ 5,677
Prior service cost (credits) 12 9
Amounts recognized in accumulated OCI 5,492 5,686
U.S. | Postretirement Health and Life Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 48 (75)
Prior service cost (credits) (6) (9)
Amounts recognized in accumulated OCI 42 (84)
Non-U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 559 454
Prior service cost (credits) 18 18
Amounts recognized in accumulated OCI 577 472
Qualified | U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 3,865 4,386
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI 3,865 4,386
Nonqualified | U.S. | Other Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 1,008 912
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI $ 1,008 $ 912