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Employee Benefit Plans (Details 7) - Level 3 - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Beginning Balance $ 134 $ 165
Actual Return on Plan Assets:    
Assets held at the reporting date 2 (32)
Assets sold during the period 0 1
Purchases, Sales and Settlements 10 0
Transfers in and/or out of Level 3 (3) 0
Ending Balance 143 134
Corporate    
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Beginning Balance 19 25
Actual Return on Plan Assets:    
Assets held at the reporting date 1 1
Assets sold during the period 0 0
Purchases, Sales and Settlements 10 (7)
Transfers in and/or out of Level 3 0 0
Ending Balance 30 19
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    
Beginning Balance 11 0
Actual Return on Plan Assets:    
Assets held at the reporting date 0 0
Assets sold during the period 0 0
Purchases, Sales and Settlements 3 11
Transfers in and/or out of Level 3 (3) 0
Ending Balance 11 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    
Beginning Balance 60 97
Actual Return on Plan Assets:    
Assets held at the reporting date 1 (33)
Assets sold during the period 0 1
Purchases, Sales and Settlements (5) (5)
Transfers in and/or out of Level 3 0 0
Ending Balance 56 60
Other    
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below    
Beginning Balance 44 43
Actual Return on Plan Assets:    
Assets held at the reporting date 0 0
Assets sold during the period 0 0
Purchases, Sales and Settlements 2 1
Transfers in and/or out of Level 3 0 0
Ending Balance $ 46 $ 44