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Retirement Benefits (Obligations and Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Change in benefit obligation:    
Settlements $ 0 $ 0
Change in plan assets:    
Settlements 0 0
Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 55 52
Service cost 0 0
Interest cost 2 3
Defined Benefit Plan, Benefit Obligation   55
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 45  
Defined Benefit Plan, Plan Assets, Amount 44 45
Amounts recognized in the consolidated balance sheets consist of:    
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position   (10)
Amounts recognized in accumulated other comprehensive income (loss) (pre-tax basis) consist of:    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax   0
Other Postretirement Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 208 208
Service cost 1 1
Interest cost 4 5
Benefits paid, net (16) (16)
Actuarial (gain) loss and other (2) 10
Defined Benefit Plan, Benefit Obligation 195 208
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 291 270
Return on plan assets and other 26 28
Employer contributions 10 9
Benefits paid, net (16) (16)
Defined Benefit Plan, Plan Assets, Amount 311 291
Amount underfunded (overfunded) at end of period (116) (83)
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 138 108
Current liabilities (2) (2)
Non-current liabilities (20) (23)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 116 83
Amounts recognized in accumulated other comprehensive income (loss) (pre-tax basis) consist of:    
Net actuarial gain (loss) (27) (18)
Prior service cost 19 21
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (8) 3
Funded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 55  
Interest cost 1 2
Benefits paid, net (2) (2)
Actuarial (gain) loss and other (2) 5
Settlements (2) (2)
Defined Benefit Plan, Benefit Obligation 50 55
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 45 43
Return on plan assets and other 2 5
Employer contributions 1 1
Benefits paid, net (2) (2)
Settlements (2) (2)
Defined Benefit Plan, Plan Assets, Amount 44 45
Amount underfunded (overfunded) at end of period 6 10
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 0 0
Current liabilities 0 0
Non-current liabilities (6) (10)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (6)  
Amounts recognized in accumulated other comprehensive income (loss) (pre-tax basis) consist of:    
Net actuarial gain (loss) 0 0
Prior service cost 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 0  
Unfunded Plans [Member]    
Change in benefit obligation:    
Settlements 0 0
Change in plan assets:    
Settlements 0 0
Unfunded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 31 34
Service cost 0 0
Interest cost 1 1
Benefits paid, net (4) (5)
Actuarial (gain) loss and other (2) 1
Defined Benefit Plan, Benefit Obligation 26 31
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 0 0
Return on plan assets and other 0 0
Employer contributions 0 0
Benefits paid, net 0 0
Defined Benefit Plan, Plan Assets, Amount 0 0
Amount underfunded (overfunded) at end of period 26 31
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 0 0
Current liabilities (4) (4)
Non-current liabilities (22) (27)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (26) (31)
Amounts recognized in accumulated other comprehensive income (loss) (pre-tax basis) consist of:    
Net actuarial gain (loss) 1 2
Prior service cost 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax $ 1 $ 2