v3.20.2
Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Plans Defined Benefit [Member] | U.S.        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 21 $ 19 $ 42 $ 39
Interest cost 17 21 34 42
Expected return on plan assets (21) (18) (42) (36)
Amortization of prior service cost (credit) 0 0 0 0
Recognized net actuarial (gain) loss 13 13 25 26
Settlements 0 11 1 17
Net periodic benefit cost 30 46 60 88
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 13 18 27 37
Interest cost 20 26 42 52
Expected return on plan assets (34) (35) (71) (70)
Amortization of prior service cost (credit) 0 (1) 0 (1)
Recognized net actuarial (gain) loss 5 8 11 16
Settlements 0 0 (1) 0
Net periodic benefit cost 4 16 8 34
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 1 0
Interest cost 1 3 3 5
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (8) (9) (16) (17)
Recognized net actuarial (gain) loss 0 0 0 (1)
Settlements 0 0 0 0
Net periodic benefit cost $ (7) $ (6) $ (12) $ (13)