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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, 2018
Dec. 31, 2017
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 $ 143 $ 134
Actual Return on Plan Assets:    
Assets held at the reporting date 15 2
Assets sold during the period (4) 0
Purchases, Sales and Settlements (24) 10
Transfers in and/or out of Level 3 (1) (3)
Fair value of plan assets at December 31 129 143
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 0 0
Actual Return on Plan Assets:    
Assets held at the reporting date 4 0
Assets sold during the period (4) 0
Purchases, Sales and Settlements 0 0
Transfers in and/or out of Level 3 1 0
Fair value of plan assets at December 31 1 0
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 30 19
Actual Return on Plan Assets:    
Assets held at the reporting date (2) 1
Assets sold during the period 0 0
Purchases, Sales and Settlements (7) 10
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 21 30
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 11 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 (4) 3
Transfers in and/or out of Level 3 (2) (3)
Fair value of plan assets at December 31 5 11
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 60
Actual Return on Plan Assets:    
Assets held at the reporting date 13 1
Assets sold during the period 0 0
Purchases, Sales and Settlements (13) (5)
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 56 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 44
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 2
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 $ 46 $ 46