v3.20.2
Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension Plans Defined Benefit [Member] | U.S.        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 21 $ 20 $ 63 $ 59
Interest cost 17 21 51 63
Expected return on plan assets (21) (18) (63) (54)
Amortization of prior service cost (credit) 0 0 0 0
Recognized net actuarial (gain) loss 12 13 37 39
Settlements 27 37 28 54
Curtailments 0 0 0 0
Net periodic benefit cost 56 73 116 161
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 14 19 41 56
Interest cost 21 25 63 77
Expected return on plan assets (37) (34) (108) (104)
Amortization of prior service cost (credit) (1) 0 (1) (1)
Recognized net actuarial (gain) loss 5 7 16 23
Settlements 0 0 (1) 0
Curtailments 0 (1) 0 (1)
Net periodic benefit cost 2 16 10 50
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 1 1 2 1
Interest cost 2 1 5 6
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (7) (7) (23) (24)
Recognized net actuarial (gain) loss 1 (1) 1 (2)
Settlements 0 0 0 0
Curtailments 0 0 0 0
Net periodic benefit cost $ (3) $ (6) $ (15) $ (19)