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Benefit Plans Contributions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure          
Contributions   $ 138     $ 275
Other Post-retirement Benefits          
Defined Benefit Plan Disclosure          
Contributions   32 $ 31    
Supplemental Employee Retirement Plan          
Defined Benefit Plan Disclosure          
Contributions   $ 6 $ 7    
Scenario, Forecast | Other Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure          
Contributions $ 137     $ 275