XML 139 R93.htm IDEA: XBRL DOCUMENT v3.10.0.1
Retirement Benefits (Schedule Of Potential Changes In Key Assumptions) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Service Cost and Interest Cost, .25% decrease in discount rate $ (2)
Benefit Obligation, .25% decrease in discount rate 135
Service Cost and Interest Cost, .25% increase in salary rate 2
Benefit Obligation, .25% increase in salary rate 12
Service Cost and Interest Cost, 1.00% increase in annual medical trend 0
Benefit Obligation, 1.00% increase in annual medical trend 0
Service Cost and Interest Cost, 1.00% decrease in annual medical trend 0
Benefit Obligation, 1.00% decrease in annual medical trend 0
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Service Cost and Interest Cost, .25% decrease in discount rate 0
Benefit Obligation, .25% decrease in discount rate 33
Service Cost and Interest Cost, .25% increase in salary rate 0
Benefit Obligation, .25% increase in salary rate 0
Service Cost and Interest Cost, 1.00% increase in annual medical trend 4
Benefit Obligation, 1.00% increase in annual medical trend 58
Service Cost and Interest Cost, 1.00% decrease in annual medical trend (4)
Benefit Obligation, 1.00% decrease in annual medical trend $ (58)