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Financial Instruments - (Narratives) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
GBP (£)
May 21, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
GBP (£)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Notional amount                       $ 0      
Senior Euro Notes due July 2024, interest payable annually at 1.100% (2024 Euro Notes) | Senior notes                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Principal amount of debt | €                           € 500,000,000  
Senior GBP Notes due May 2031, interest payable annually at 3.360% (2031 GBP Notes) | Senior notes                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Principal amount of debt | £                     £ 625,000,000        
Senior Euro Notes due January 2021, interest payable annually at 0.400% (2021 Euro Notes) | Senior notes                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Principal amount of debt | €                           € 500,000,000  
Senior GBP Notes due June 2022, interest payable annually at 1.700% (2022 GBP Notes) | Senior notes                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Principal amount of debt | £                             £ 300,000,000
Cash Flow Hedging                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Notional amount   $ 0   $ 0               0      
Net Investment Hedges | Floating Rate Notes, May 2021 Euro Notes, 2023 Euro Notes, 2027 Euro Notes, 2030 Euro Notes, 2039 Euro Notes, and ECP Notes | Senior notes                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Notional amount | €           € 7,616,000,000                  
Net Investment Hedges | Senior GBP Notes due May 2031, interest payable annually at 3.360% (2031 GBP Notes) | Senior notes                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Notional amount | £             £ 264,000,000                
Currency forward contract                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Gain from settlement of derivative contract   1,000,000                          
Loss on the settlement of derivative contract       14,000,000                      
Currency forward contract | Net Investment Hedges                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Amount of gains reclassified from AOCE into income   185,000,000 $ 10,000,000 $ 198,000,000 $ 38,000,000                    
Interest rate swap | Cash Flow Hedging                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Notional amount               $ 500,000,000 € 1,500,000,000 £ 500,000,000          
Payments for the settlement of derivatives classified as hedging $ 17,000,000                            
Interest rate swap | Cash Flow Hedging | Minimum                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Estimated period to transfer derivative OCI to interest expense       4 years                      
Interest rate swap | Cash Flow Hedging | Maximum                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Estimated period to transfer derivative OCI to interest expense       12 years                      
Interest rate swap | Fair Value Hedging                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Notional amount | €                         € 500,000,000    
Interest rate swap | Fair Value Hedging | Senior Euro Notes due July 2024, interest payable annually at 1.100% (2024 Euro Notes) | Senior notes                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Derivative asset fair value   18,000,000   $ 18,000,000                      
Interest rate swap | Net Investment Hedges                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives                              
Notional amount                       $ 716,000,000      
Derivative asset fair value   $ 35,000,000   $ 35,000,000