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EBP Benefit Pymts & Defined Contribution Plans (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Expected benefit payments      
Employer's contributions charged to expense under defined contribution plans $ 36 $ 35 $ 34
Other Postretirement Benefits [Member]      
Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 6    
Expected benefit payments      
2020 14    
2021 14    
2022 14    
2023 14    
2024 14    
2025-2029 62    
Pension Benefits [Member]      
Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 13    
Expected benefit payments      
2020 100    
2021 99    
2022 97    
2023 93    
2024 90    
2025-2029 433    
Nonqualified Plan [Member]      
Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 3    
Qualified Plan [Member]      
Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate $ 10