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Debt (Narrative) (Details)
£ in Billions
1 Months Ended 9 Months Ended
Sep. 18, 2018
USD ($)
Apr. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Oct. 01, 2018
USD ($)
Sep. 18, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Commercial paper outstanding     $ 75,000,000     $ 0  
Repayments of senior debt   $ 250,000,000          
4.20% Senior Debt Obligations Due 2048              
Debt Instrument [Line Items]              
Proceeds from issuance of debt     $ 600,000,000        
Interest rate     4.20%        
2.75% Senior Debt Obligations Due 2022              
Debt Instrument [Line Items]              
Proceeds from issuance of debt             $ 500,000,000
Interest rate     2.75%       2.75%
4.35% Senior Debt Obligation Due 2047              
Debt Instrument [Line Items]              
Proceeds from issuance of debt             $ 500,000,000
Interest rate     4.35%       4.35%
3.30% Senior Debt Obligations Due 2023              
Debt Instrument [Line Items]              
Interest rate     3.30%        
Amended Revolving Credit Facility March 27, 2014              
Debt Instrument [Line Items]              
Debt facilities, maximum borrowing capacity     $ 1,500,000,000.0        
Term of debt     5 years        
Revolving credit facility, amount outstanding     $ 0        
Commercial Paper              
Debt Instrument [Line Items]              
Debt financing program     $ 1,500,000,000        
Effective interest rate     2.41%        
Bridge Loan              
Debt Instrument [Line Items]              
Duration fee ninety days after first borrowing, percent     50.00%        
Duration fee one hundred and eighty days after first borrowing, percent     75.00%        
Duration fee two hundred and seventy days after first borrowing, percent     100.00%        
Jardine Lloyd Thompson Group plc | Bridge Loan              
Debt Instrument [Line Items]              
Derivative, notional amount | £         £ 5.2    
Payments of debt issuance costs $ 24,000,000            
Amortization of debt issuance costs $ 3,000,000            
Subsequent Event | Amended Revolving Credit Facility March 27, 2014              
Debt Instrument [Line Items]              
Debt facilities, maximum borrowing capacity       $ 1,800,000,000