Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Employee Benefit Plans - Pretax Amounts Included in Accumulated OCI (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) $ 5,172 $ 5,554
Prior service cost (credits) (7) 16
Amounts recognized in accumulated OCI 5,165 5,570
U.S. | Postretirement Health and Life Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) (30) (44)
Prior service cost (credits) (11) 12
Amounts recognized in accumulated OCI (41) (32)
Non-U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 196 216
Prior service cost (credits) 4 4
Amounts recognized in accumulated OCI 200 220
Qualified | U.S. | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 3,992 4,429
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI 3,992 4,429
Nonqualified | U.S. | Other Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain) 1,014 953
Prior service cost (credits) 0 0
Amounts recognized in accumulated OCI $ 1,014 $ 953