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EBP Benefit Pymts & Defined Contribution Plans (Details 6) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Employer's contributions charged to expense under defined contribution plans $ 39 $ 39 $ 27
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 7    
Expected benefit payments      
2016 13    
2017 13    
2018 13    
2019 13    
2020 14    
2021-2025 66    
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 62    
Expected benefit payments      
2016 95    
2017 102    
2018 105    
2019 106    
2020 110    
2021-2025 578    
Nonqualified Pension Benefits - Supplemental Employee Retirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate 2    
Tax-qualified Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected total plans contribution, approximate $ 60