v3.21.1
Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Plans Defined Benefit [Member] | U.S.    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost $ 21 $ 21
Interest cost 13 17
Expected return on plan assets (24) (21)
Amortization of prior service cost (credit) 0 0
Recognized net actuarial loss 15 12
Settlements 2 1
Curtailments (gain) loss 12 0
Special Termination Benefits 9 0
Net periodic benefit cost 48 30
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 15 14
Interest cost 20 22
Expected return on plan assets (30) (37)
Amortization of prior service cost (credit) 0 0
Recognized net actuarial loss 8 6
Settlements 0 (1)
Curtailments (gain) loss 0 0
Special Termination Benefits 0 0
Net periodic benefit cost 13 4
Other Postretirement Benefit Plans, Defined Benefit [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 0 1
Interest cost 1 2
Expected return on plan assets 0 0
Amortization of prior service cost (credit) (9) (8)
Recognized net actuarial loss 0 0
Settlements 0 0
Curtailments (gain) loss 0 0
Special Termination Benefits 0 0
Net periodic benefit cost $ (8) $ (5)