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Employee Benefits Schedule of Defined Benefit Plan Disclosures (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets $ 5 $ 4  
Fair value of plan assets:      
Interest cost on benefit obligation 3    
As of January 1   559  
Classification in consolidated balance sheet:      
Noncurrent asset (37) (34)  
Noncurrent liability (284) (281)  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets 0 0  
Fair value of plan assets:      
As of January 1 0 0  
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets 0 0  
Fair value of plan assets:      
As of January 1 83 52  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets 5 4  
Fair value of plan assets:      
As of January 1 0 0  
Pension Plans, Defined Benefit [Member]      
Benefit obligation:      
As of January 1 869 797 $ 758
Fair value of plan assets:      
Service cost 17 16 18
Interest cost on benefit obligation 33 33 31
Participants’ contributions 0 0  
Actuarial loss (gain) 60 26  
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 0 0  
Benefit payments (36) (34)  
Defined Benefit Plan, Plan Assets, Administration Expense (2) (2)  
As of January 1 629 559 550
Unfunded position as of December 31 240 238  
Net actuarial loss (gain) included in comprehensive income (4) 21  
Defined Benefit Plan, Amortization of Gain (Loss) (13) (14) (20)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0 0
Total Amounts included in comprehensive income (17) 7  
Defined Benefit Plan, Accumulated Benefit Obligation 778 714  
Actual return on plan assets 106 45  
Company contributions 2 0  
Classification in consolidated balance sheet:      
Noncurrent asset 0 0  
Current liability 0 0  
Noncurrent liability (240) (238)  
Amounts included in AOCL:      
Net actuarial loss 218 236  
Prior service cost 0 0  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax $ 218 $ 236  
Assumptions used:      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate 3.65% 4.17%  
Discount rate used to calculate benefit obligation 4.17% 4.36%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase 4.58% 3.65%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 3.65% 3.65%  
Long-term rate of return on plan assets 7.50% 7.50%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.50% 7.50%  
Other Postretirement Benefit Plans [Member]      
Benefit obligation:      
As of January 1 $ 78 $ 73 81
Fair value of plan assets:      
Service cost 2 2 2
Interest cost on benefit obligation 3 4 3
Participants’ contributions 2 2  
Actuarial loss (gain) 3 (11)  
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 1 0  
Benefit payments (6) (5)  
Defined Benefit Plan, Plan Assets, Administration Expense 0 0  
As of January 1 33 30 30
Unfunded position as of December 31 45 43  
Net actuarial loss (gain) included in comprehensive income 0 (10)  
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 (1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 (1) (1)
Total Amounts included in comprehensive income 0 (11)  
Actual return on plan assets 4 1  
Company contributions 3 2  
Classification in consolidated balance sheet:      
Noncurrent asset 0 0  
Current liability 0 0  
Noncurrent liability (45) (43)  
Amounts included in AOCL:      
Net actuarial loss (1) (2)  
Prior service cost 0 1  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax $ (1) $ (1)  
Assumptions used:      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate 3.42% 3.75%  
Defined Benefit Plan Discount rate - upper range 3.70% 4.23%  
Discount rate used to calculate benefit obligation 3.75% 3.90%  
Defined Benefit Plan Cost Discount rate - upper range 4.23% 4.45%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase 4.58% 4.58%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 4.58% 4.58%  
Long-term rate of return on plan assets 6.26% 6.26%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 6.26% 6.29%  
Non Qualified Benefit Plans [Member]      
Benefit obligation:      
As of January 1 $ 27 $ 27 27
Fair value of plan assets:      
Service cost 0 0 0
Interest cost on benefit obligation 1 1 1
Participants’ contributions 0 0  
Actuarial loss (gain) 1 1  
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 0 0  
Benefit payments (2) (2)  
Defined Benefit Plan, Plan Assets, Administration Expense 0 0  
As of January 1 17 16 15
Unfunded position as of December 31 10 11  
Net actuarial loss (gain) included in comprehensive income 1 1  
Defined Benefit Plan, Amortization of Gain (Loss) (1) (1) (1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0 $ 0
Total Amounts included in comprehensive income 0 0  
Defined Benefit Plan, Accumulated Benefit Obligation 27 27  
Actual return on plan assets 1 1  
Company contributions 2 2  
Classification in consolidated balance sheet:      
Noncurrent asset (17) (16)  
Current liability (2) (2)  
Noncurrent liability (25) (25)  
Amounts included in AOCL:      
Net actuarial loss 13 13  
Prior service cost 0 0  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax $ 13 $ 13  
Assumptions used:      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate 3.65% 4.17%  
Discount rate used to calculate benefit obligation 4.17% 4.36%