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Debt (Narrative) (Details)
£ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Sep. 18, 2018
USD ($)
Jan. 31, 2019
GBP (£)
Oct. 31, 2018
Apr. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Jan. 31, 2019
USD ($)
Oct. 01, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 18, 2018
GBP (£)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Debt Instrument [Line Items]                          
Commercial paper outstanding           $ 0              
Debt maturity         $ 250,000,000                
3.75% Senior Debt Obligations Due 2026                          
Debt Instrument [Line Items]                          
Interest rate           3.75%              
4.20% Senior Debt Obligations Due 2048                          
Debt Instrument [Line Items]                          
Debt instrument, amount                     $ 600,000,000    
Interest rate           4.20%         4.20%    
Amended Revolving Credit Facility November 24, 2015                          
Debt Instrument [Line Items]                          
Debt instrument, term       5 years                  
Revolving credit facility, borrowing capacity                 $ 1,500,000,000.0        
Revolving credit facility, amount outstanding           $ 0              
Amended Revolving Credit Facility March 28, 2014                          
Debt Instrument [Line Items]                          
Revolving credit facility, borrowing capacity               $ 1,800,000,000.0          
Other Debt Facilities                          
Debt Instrument [Line Items]                          
Revolving credit facility, amount outstanding           0           $ 0  
Debt instrument, unused borrowing capacity           594,000,000           $ 624,000,000  
Commercial Paper                          
Debt Instrument [Line Items]                          
Short-term debt           $ 1,500,000,000              
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%              
Senior Notes                          
Debt Instrument [Line Items]                          
Debt maturity $ 250,000,000                        
Senior Notes | 2.75% Senior Debt Obligations Due 2022                          
Debt Instrument [Line Items]                          
Debt instrument, amount                         $ 500,000,000
Interest rate                         2.75%
Senior Notes | 4.35% Senior Debt Obligations Due 2047                          
Debt Instrument [Line Items]                          
Debt instrument, amount                         $ 500,000,000
Interest rate                         4.35%
Jardine Lloyd Thompson Group plc | Bridge Loan                          
Debt Instrument [Line Items]                          
Derivative, notional amount | £                   £ 5,200      
Payments of debt issuance costs   $ 35,000,000                      
Amortization of debt issuance costs   $ 30,000,000                      
Subsequent Event | Bridge Loan                          
Debt Instrument [Line Items]                          
Decrease in debt | £     £ (3,790)                    
Subsequent Event | Senior Notes                          
Debt Instrument [Line Items]                          
Debt instrument, amount             $ 5,000,000,000            
Subsequent Event | Senior Notes | 3.50% Senior Debt Obligations Due 2020                          
Debt Instrument [Line Items]                          
Debt instrument, amount             $ 700,000,000            
Interest rate             3.50%            
Subsequent Event | Senior Notes | 3.875% Senior Debt Obligations Due 2024                          
Debt Instrument [Line Items]                          
Debt instrument, amount             $ 1,000,000,000.0            
Interest rate             3.875%            
Subsequent Event | Senior Notes | 4.375% Senior Debt Obligations Due 2029                          
Debt Instrument [Line Items]                          
Debt instrument, amount             $ 1,250,000,000.00            
Interest rate             4.375%            
Subsequent Event | Senior Notes | 4.75% Senior Debt Obligations Due 2039                          
Debt Instrument [Line Items]                          
Debt instrument, amount             $ 500,000,000            
Interest rate             4.75%            
Subsequent Event | Senior Notes | 4.90% Senior Debt Obligations Due 2049                          
Debt Instrument [Line Items]                          
Debt instrument, amount             $ 1,250,000,000.00            
Interest rate             4.90%            
Subsequent Event | Senior Notes | Floating Rate Senior Notes Due 2021                          
Debt Instrument [Line Items]                          
Debt instrument, amount             $ 300,000,000