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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Plans Defined Benefit [Member] | U.S.        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 19 $ 22 $ 39 $ 43
Interest cost 21 27 42 54
Expected return on plan assets (18) (35) (36) (69)
Amortization of prior service cost (credit) 0 0 0 0
Recognized net actuarial (gain) loss 13 16 26 31
Settlements 11 147 17 147
Net periodic benefit cost 46 177 88 206
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 18 22 37 43
Interest cost 26 27 52 54
Expected return on plan assets (35) (40) (70) (80)
Amortization of prior service cost (credit) (1) (2) (1) (3)
Recognized net actuarial (gain) loss 8 9 16 18
Settlements 0 0 0 0
Net periodic benefit cost 16 16 34 32
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 1 0 1
Interest cost 3 2 5 4
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (9) (8) (17) (17)
Recognized net actuarial (gain) loss 0 (1) (1) (1)
Settlements 0 0 0 0
Net periodic benefit cost $ (6) $ (6) $ (13) $ (13)