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Benefit Plans - Components of Net Periodic Pension Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Simplify to Grow Program | Severance and related costs      
Defined Benefit Plan Disclosure [Line Items]      
Settlement (gains) losses $ 3 $ 5 $ 5
Pension Plans | U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 6 38 43
Interest cost 49 60 61
Expected return on plan assets (77) (88) (88)
Net loss/(gain) 17 30 32
Prior service cost/(benefit) 1 1 2
Settlement losses and other expenses [1] 18 16 35
Net periodic pension cost 14 57 85
Settlement (gains) losses 13 12 31
Pension Plans | Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 121 122 146
Interest cost 149 202 199
Expected return on plan assets (400) (404) (448)
Net loss/(gain) 118 148 163
Prior service cost/(benefit) (7) (6) (2)
Settlement losses and other expenses [1] 4 (3) 5
Net periodic pension cost (15) 59 63
Settlement (gains) losses $ 6 $ (4) $ 4
[1] Settlement losses of $3 million in 2020, $5 million in 2019 and $5 million in 2018 were incurred in connection with our Simplify to Grow Program. See Note 8, Restructuring Program, for more information. Net settlement losses of $13 million for our U.S. plans and settlement losses of $6 million for our non-U.S. plans in 2020, settlement losses of $12 million for our U.S. plans and settlement gains of $4 million for our non-U.S. plans in 2019 and settlement losses of $31 million for our U.S. plans and $4 million for our non-U.S. plans in 2018 related to lump-sum payment elections made by retired employees.