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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, 2020
Dec. 31, 2019
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 $ 112 $ 129
Actual Return on Plan Assets:    
Assets held at the reporting date 1 (1)
Assets sold during the period (10) 0
Purchases, Sales and Settlements (10) (19)
Transfers in and/or out of Level 3 0 3
Fair value of plan assets at December 31 93 112
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 1
Actual Return on Plan Assets:    
Assets held at the reporting date 0 (1)
Assets sold during the period 0 0
Purchases, Sales and Settlements 0 0
Transfers in and/or out of Level 3 0 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 3 21
Actual Return on Plan Assets:    
Assets held at the reporting date 0 1
Assets sold during the period 0 0
Purchases, Sales and Settlements (3) (19)
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 0 3
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 7 5
Actual Return on Plan Assets:    
Assets held at the reporting date 0 0
Assets sold during the period 0 0
Purchases, Sales and Settlements (5) 0
Transfers in and/or out of Level 3 0 2
Fair value of plan assets at December 31 2 7
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 55 56
Actual Return on Plan Assets:    
Assets held at the reporting date 0 0
Assets sold during the period (10) 0
Purchases, Sales and Settlements 0 (1)
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 45 55
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 (1)
Assets sold during the period 0 0
Purchases, Sales and Settlements (2) 1
Transfers in and/or out of Level 3 0 0
Fair value of plan assets at December 31 $ 45 $ 46