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Employee Benefits - Narrative (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
trust
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Total cost for retirement plans $ 70,000,000 $ 69,000,000 $ 91,000,000
Defined contribution plan cost 70,000,000 65,000,000 67,000,000
Pension trust assets $ 2,219,000,000 $ 2,073,000,000  
Shares purchased by US plan under defined contribution plan | shares 228,248 216,035  
Shares sold by US plan under defined contribution plan | shares 297,750 437,283  
Shares held by the US plan under defined contribution plan | shares 1,500,000 1,600,000  
Shares held by the US plan under defined contribution plan, market value $ 255,000,000 $ 171,000,000  
Dividend received by the plan $ 3,000,000 2,000,000  
United States Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Number of pension trust accounts | trust 1    
Pension trust assets $ 1,739,000,000 1,632,000,000  
United Kingdom Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost (credit) $ (6,000,000) (10,000,000) (10,000,000)
Number of pension trust accounts | trust 1    
Pension trust assets $ 480,000,000 441,000,000  
Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss to be recognized in net periodic pension cost 19,000,000    
Prior service cost to be recognized in net periodic benefit cost 0    
Net periodic benefit cost (credit) (23,000,000) (25,000,000) (5,000,000)
Expected required employer contribution $ 9,000,000    
Number of pension trust accounts | trust 2    
Pension trust assets $ 2,219,000,000 2,073,000,000 2,023,000,000
Postretirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss to be recognized in net periodic pension cost 0    
Prior service cost to be recognized in net periodic benefit cost 0    
Net periodic benefit cost (credit) (2,000,000) 1,000,000 2,000,000
Expected required employer contribution 7,000,000    
Pension trust assets $ 20,000,000 $ 0 $ 0
Equity Securities, Domestic | United States Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 27.00%    
Equity Securities, International | United States Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 5.00%    
Debt Securities and Short-Term Investments | United States Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 68.00%    
Equity Securities | United Kingdom Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 20.00%    
Diversified Growth Funds | United Kingdom Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 30.00%    
Fixed Income Funds | United Kingdom Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 40.00%    
Real estate funds | United Kingdom Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 10.00%