XML 80 R64.htm IDEA: XBRL DOCUMENT v3.10.0.1
Employee Benefits - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
trust
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Total cost for retirement plans $ 80 $ 70 $ 69
Defined contribution plan cost 79 70 65
Pension trust assets $ 1,987 $ 2,219  
Stock purchased by US plan under defined contribution plan (shares) | shares 193,051 228,248  
Stock sold by US plan under defined contribution plan (shares) | shares 205,798 297,750  
Stock held by the US plan under defined contribution plan (shares) | shares 1,500,000    
Market value of stock held by the US plan under defined contribution plan $ 251 $ 255  
Dividend received by the plan $ 3    
United States Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Number of pension trust accounts | trust 1    
Pension trust assets $ 1,572 1,739  
United Kingdom Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Number of pension trust accounts | trust 1    
Pension trust assets $ 415 480  
Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial gain (loss) to be recognized in net periodic pension cost (13)    
Other components of net periodic benefit cost (26) (23) (25)
Expected required employer contribution $ 46    
Number of pension trust accounts | trust 2    
Pension trust assets $ 1,987 2,219 2,073
Retirement Plans | United Kingdom Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Other components of net periodic benefit cost (10) (6) (10)
Postretirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial gain (loss) to be recognized in net periodic pension cost 2    
Prior service cost to be recognized in net periodic benefit cost 1    
Other components of net periodic benefit cost (2) (2) 1
Expected required employer contribution 6    
Pension trust assets $ 16 $ 20 $ 0
Equity Securities, Domestic | United States Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 16.00%    
Equity Securities, International | United States Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 9.00%    
Debt Securities and Short-Term Investments | United States Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations 75.00%    
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%