v3.20.1
Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Pension Plans Defined Benefit [Member] | U.S.    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost $ 21 $ 20
Interest cost 17 21
Expected return on plan assets (21) (18)
Amortization of prior service cost (credit) 0 0
Recognized net actuarial (gain) loss 12 13
Settlements 1 6
Net periodic benefit cost 30 42
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 14 19
Interest cost 22 26
Expected return on plan assets (37) (35)
Amortization of prior service cost (credit) 0 0
Recognized net actuarial (gain) loss 6 8
Settlements (1) 0
Net periodic benefit cost 4 18
Other Postretirement Benefit Plans, Defined Benefit [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 1 0
Interest cost 2 2
Expected return on plan assets 0 0
Amortization of prior service cost (credit) (8) (8)
Recognized net actuarial (gain) loss 0 (1)
Settlements 0 0
Net periodic benefit cost $ (5) $ (7)