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Employee Benefit Plans - Summary of Change in Assets Measured at Level 3 (Details) - Level 3 - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Fair value of plan assets at January 1 $ 129 $ 143
Actual Return on Plan Assets:    
Assets held at the reporting date (1) 15
Assets sold during the period 0 (4)
Purchases, Sales and Settlements (19) (24)
Transfers in and/or out of Level 3 3 (1)
Fair value of plan assets at December 31 112 129
International    
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Fair value of plan assets at January 1 1 0
Actual Return on Plan Assets:    
Assets held at the reporting date (1) 4
Assets sold during the period 0 (4)
Purchases, Sales and Settlements 0 0
Transfers in and/or out of Level 3 1 1
Fair value of plan assets at December 31 1 1
Corporate    
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Fair value of plan assets at January 1 21 30
Actual Return on Plan Assets:    
Assets held at the reporting date 1 (2)
Assets sold during the period 0 0
Purchases, Sales and Settlements (19) (7)
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 3 21
Bank Loans    
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Fair value of plan assets at January 1 5 11
Actual Return on Plan Assets:    
Assets held at the reporting date 0 0
Assets sold during the period 0 0
Purchases, Sales and Settlements 0 (4)
Transfers in and/or out of Level 3 2 (2)
Fair value of plan assets at December 31 7 5
Real Estate    
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Fair value of plan assets at January 1 56 56
Actual Return on Plan Assets:    
Assets held at the reporting date 0 13
Assets sold during the period 0 0
Purchases, Sales and Settlements (1) (13)
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 55 56
Other    
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Fair value of plan assets at January 1 46 46
Actual Return on Plan Assets:    
Assets held at the reporting date (1) 0
Assets sold during the period 0 0
Purchases, Sales and Settlements 1 0
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 $ 46 $ 46