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, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) $ 5,677 $ 5,172
Prior service cost (credits) 9 (7)
Amounts recognized in accumulated OCI 5,686 5,165
U.S. | Postretirement Health and Life Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) (75) (30)
Prior service cost (credits) (9) (11)
Amounts recognized in accumulated OCI (84) (41)
Non-U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 454 196
Prior service cost (credits) 18 4
Amounts recognized in accumulated OCI 472 200
Qualified | U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 4,386 3,992
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI 4,386 3,992
Nonqualified | U.S. | Other Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 912 1,014
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI $ 912 $ 1,014