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Retirement Benefits (Obligations and Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Change in benefit obligation:    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements $ 0 $ 0
Change in plan assets:    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0
Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Interest Cost 3 25
Change in plan assets:    
Defined Benefit Plan, Fair Value of Plan Assets 15  
Defined Benefit Plan, Fair Value of Plan Assets 12 15
Other Postretirement Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 181 203
Defined Benefit Plan, Interest Cost 4 4
Defined Benefit Plan, Plan Amendments 0 0
Defined Benefit Plan, Benefits Paid (21) (20)
Defined Benefit Plan, Actuarial Gain (Loss) 2 (6)
Defined Benefit Plan, Benefit Obligation 166 181
Change in plan assets:    
Defined Benefit Plan, Fair Value of Plan Assets 261 272
Defined Benefit Plan, Actual Return on Plan Assets 6 0
Defined Benefit Plan, Contributions by Employer 10 9
Defined Benefit Plan, Benefits Paid (21) (20)
Defined Benefit Plan, Fair Value of Plan Assets 256 261
Defined Benefit Plan, Funded Status of Plan (90) (80)
Amounts recognized in the consolidated balance sheets consist of:    
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent 114 103
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities (2) (2)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent (23) (22)
Defined Benefit Plan, Amounts Recognized in Balance Sheet 89 79
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of:    
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax (13) (18)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax 15 16
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 2 (2)
Funded Plans [Member]    
Change in benefit obligation:    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0  
Change in plan assets:    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0  
Funded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 20 718
Defined Benefit Plan, Interest Cost 1 23
Defined Benefit Plan, Plan Amendments 0 0
Defined Benefit Plan, Benefits Paid (1) (46)
Defined Benefit Plan, Actuarial Gain (Loss) (2) 16
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements   (691)
Defined Benefit Plan, Benefit Obligation 18 20
Change in plan assets:    
Defined Benefit Plan, Fair Value of Plan Assets 15 598
Defined Benefit Plan, Actual Return on Plan Assets (2) 16
Defined Benefit Plan, Contributions by Employer 0 138
Defined Benefit Plan, Benefits Paid (1) (46)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements   (691)
Defined Benefit Plan, Fair Value of Plan Assets 12 15
Defined Benefit Plan, Funded Status of Plan 6 5
Amounts recognized in the consolidated balance sheets consist of:    
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent 0 0
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities 0 0
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent (6) (5)
Defined Benefit Plan, Amounts Recognized in Balance Sheet (6) (5)
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of:    
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax 0 2
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax 0 0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 0 2
Unfunded Plans [Member]    
Change in benefit obligation:    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0
Change in plan assets:    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0
Unfunded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 57 65
Defined Benefit Plan, Interest Cost 2 2
Defined Benefit Plan, Plan Amendments 0 0
Defined Benefit Plan, Benefits Paid (7) (8)
Defined Benefit Plan, Actuarial Gain (Loss) (1) (2)
Defined Benefit Plan, Benefit Obligation 51 57
Change in plan assets:    
Defined Benefit Plan, Benefits Paid (7) (8)
Defined Benefit Plan, Funded Status of Plan 51 57
Amounts recognized in the consolidated balance sheets consist of:    
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent 0 0
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities (7) (9)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent (44) (48)
Defined Benefit Plan, Amounts Recognized in Balance Sheet (51) (57)
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of:    
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax 0 4
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax 0 0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 0 4
Change in Plan Assets [Member] | Unfunded Plans [Member]    
Change in benefit obligation:    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0
Change in plan assets:    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0
Change in Plan Assets [Member] | Unfunded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefits Paid 0 0
Change in plan assets:    
Defined Benefit Plan, Fair Value of Plan Assets 0 0
Defined Benefit Plan, Actual Return on Plan Assets 0 0
Defined Benefit Plan, Contributions by Employer 0 0
Defined Benefit Plan, Benefits Paid 0 0
Defined Benefit Plan, Fair Value of Plan Assets $ 0 $ 0