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Retirement Benefits (Obligations and Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Change in benefit obligation:    
Settlements $ 0 $ 0
Defined Benefit Plan, Plan Assets, Divestiture 0 0
Defined Benefit Plan, Benefit Obligation, Divestiture 0 0
Change in plan assets:    
Settlements 0 0
Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 50 55
Service cost 0 0
Interest cost 2 2
Defined Benefit Plan, Benefit Obligation   50
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 44  
Defined Benefit Plan, Plan Assets, Amount 20 44
Amounts recognized in the consolidated balance sheets consist of:    
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position   (6)
Amounts recognized in accumulated other comprehensive income (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 195 208
Service cost 1 1
Interest cost 4 4
Benefits paid, net (14) (16)
Actuarial gain and other (38) (2)
Defined Benefit Plan, Benefit Obligation 148 195
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 311 291
Return on plan assets and other (41) 26
Employer contributions 3 10
Benefits paid, net (14) (16)
Defined Benefit Plan, Plan Assets, Amount 259 311
Amount underfunded (overfunded) at end of period (111) (116)
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 127 138
Current liabilities (2) (2)
Non-current liabilities (14) (20)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 111 116
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:    
Net actuarial gain (loss) 5 (27)
Prior service cost (credit) (3) 19
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 2 (8)
Funded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 50  
Interest cost 1 1
Benefits paid, net (1) (2)
Actuarial gain and other (8) (2)
Settlements 0 (2)
Defined Benefit Plan, Plan Assets, Divestiture (20) 0
Defined Benefit Plan, Benefit Obligation, Divestiture (20) 0
Defined Benefit Plan, Benefit Obligation 22 50
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 44 45
Return on plan assets and other (4) 2
Employer contributions 1 1
Benefits paid, net (1) (2)
Settlements 0 (2)
Defined Benefit Plan, Plan Assets, Amount 20 44
Amount underfunded (overfunded) at end of period 2 6
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 0 0
Current liabilities 0 0
Non-current liabilities (2) (6)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (2)  
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:    
Net actuarial gain (loss) 0 0
Prior service cost (credit) 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
Defined Benefit Plan, Plan Assets, Divestiture 0 0
Defined Benefit Plan, Benefit Obligation, Divestiture (2) 0
Change in plan assets:    
Settlements 0 0
Unfunded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 26 31
Service cost 0 0
Interest cost 1 1
Benefits paid, net (3) (4)
Actuarial gain and other (3) (2)
Defined Benefit Plan, Benefit Obligation 19 26
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 19 26
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 0 0
Current liabilities (3) (4)
Non-current liabilities (16) (22)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (19) (26)
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:    
Net actuarial gain (loss) (2) 1
Prior service cost (credit) 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax $ (2) $ 1