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Pension and Postretirement Benefit Plans - Pension Asset Fair Value Level 3 (Details) - Qualified and Non-qualified Pension Benefits - International - Funded - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Benefit Plan Information    
Foreign currency exchange $ (80) $ 346
Level 3    
Benefit Plan Information    
Defined benefit plan increases related to net purchases and unrealized gains losses $ 17  
Defined benefit plan decreases related to net purchases and unrealized gains losses   $ 11