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Employee Benefits - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
trust
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Compensation and Retirement Disclosure [Abstract]      
Total cost for retirement plans $ 91 $ 81 $ 96
Defined contribution plan cost $ 67 $ 74 75
Shares purchased by US plan under defined contribution plan | shares 223,656 301,924  
Shares sold by US plan under defined contribution plan | shares 247,984 629,086  
Shares held by the US plan under defined contribution plan | shares 1,800,000 1,900,000  
Shares held by the US plan under defined contribution plan, market value $ 179 $ 165  
Dividend received by the plan $ 2 3  
Defined Benefit Plan Disclosure [Line Items]      
Number of pension trust accounts | trust 2    
Pension trust assets $ 2,023 2,236  
Retirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss to be recognized in net periodic pension cost 16    
Net periodic benefit cost (credit) (5) (23) (5)
Curtailment gain     8
Expected required employer contribution 7    
Pension trust assets 2,023 2,236 2,088
United States Retirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension trust assets 1,600 1,800  
United Kingdom Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost (credit) (10) (8) (10)
Pension trust assets 425 443  
Postretirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost (credit) 2 3 (6)
Expected required employer contribution 9    
Pension trust assets $ 0 0 $ 0
Equity Securities, Domestic [Member] | United States Retirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 26.00%    
Equity Securities, International [Member] | United States Retirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 6.00%    
Debt Securities and Short-Term Investments [Member] | United States Retirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 68.00%    
Equity Securities [Member] | United Kingdom Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 20.00%    
Diversified Growth Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension trust assets $ 15 $ 14  
Diversified Growth Funds [Member] | United Kingdom Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 40.00%    
Fixed Income Funds [Member] | United Kingdom Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 40.00%    
UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Number of pension trust accounts | trust 1    
UNITED KINGDOM      
Defined Benefit Plan Disclosure [Line Items]      
Number of pension trust accounts | trust 1