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EBP Benefit Pymts & Defined Contribution Plans (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Expected benefit payments      
Employer's contributions charged to expense under defined contribution plans $ 34 $ 36 $ 39
Other Postretirement Benefits [Member]      
Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 6    
Expected benefit payments      
2018 13    
2019 13    
2020 14    
2021 13    
2022 13    
2023-2027 60    
Pension Benefits [Member]      
Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 85    
Expected benefit payments      
2018 91    
2019 90    
2020 92    
2021 96    
2022 96    
2023-2027 486    
Nonqualified Plan [Member]      
Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 5    
Qualified Plan [Member]      
Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate $ 80