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Retirement Benefits (Obligations and Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Change in benefit obligation:    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ 0 $ 0
Change in plan assets:    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0
Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Interest Cost 2 3
Change in plan assets:    
Defined Benefit Plan, Fair Value of Plan Assets 12  
Defined Benefit Plan, Fair Value of Plan Assets 1 12
Other Postretirement Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 166 181
Defined Benefit Plan, Interest Cost 4 4
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 7 0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (20) (21)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (1) 2
Defined Benefit Plan, Benefit Obligation 156 166
Change in plan assets:    
Defined Benefit Plan, Fair Value of Plan Assets 256 261
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 11 6
Defined Benefit Plan, Plan Assets, Contributions by Employer 10 10
Defined Benefit Plan, Fair Value of Plan Assets 257 256
Defined Benefit Plan, Funded (Unfunded) Status of Plan (101) (90)
Amounts recognized in the consolidated balance sheets consist of:    
Assets for Plan Benefits, Defined Benefit Plan 127 114
Liability, Defined Benefit Plan, Current (2) (2)
Liability, Defined Benefit Plan, Noncurrent (24) (23)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 101 89
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of:    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax (18) (13)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 21 15
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 3 2
Defined Benefit Plan, Plan Assets, Benefits Paid 20 21
Funded Plans [Member]    
Change in benefit obligation:    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement (18)  
Change in plan assets:    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement (18)  
Funded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 18 20
Defined Benefit Plan, Interest Cost 1 1
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (2) (1)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 2 (2)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement   0
Defined Benefit Plan, Benefit Obligation 1 18
Change in plan assets:    
Defined Benefit Plan, Fair Value of Plan Assets 12 15
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 3 (2)
Defined Benefit Plan, Plan Assets, Contributions by Employer 6 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement   0
Defined Benefit Plan, Fair Value of Plan Assets 1 12
Defined Benefit Plan, Funded (Unfunded) Status of Plan 0 6
Amounts recognized in the consolidated balance sheets consist of:    
Assets for Plan Benefits, Defined Benefit Plan 0 0
Liability, Defined Benefit Plan, Current 0 0
Liability, Defined Benefit Plan, Noncurrent 0 (6)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 0 (6)
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of:    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 0 0
Defined Benefit Plan, Plan Assets, Benefits Paid 2 1
Unfunded Plans [Member]    
Change in benefit obligation:    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0
Change in plan assets:    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0
Unfunded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 51 57
Defined Benefit Plan, Interest Cost 1 2
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (6) (7)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 1 (1)
Defined Benefit Plan, Benefit Obligation 47 51
Change in plan assets:    
Defined Benefit Plan, Fair Value of Plan Assets 0 0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0 0
Defined Benefit Plan, Plan Assets, Contributions by Employer 0 0
Defined Benefit Plan, Fair Value of Plan Assets 0 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan 47 51
Amounts recognized in the consolidated balance sheets consist of:    
Assets for Plan Benefits, Defined Benefit Plan 0 0
Liability, Defined Benefit Plan, Current (8) (7)
Liability, Defined Benefit Plan, Noncurrent (39) (44)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (47) (51)
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of:    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax 5 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 5 0
Defined Benefit Plan, Plan Assets, Benefits Paid $ 0 $ 0