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Financial Instruments (Narratives) (Details)
1 Months Ended 12 Months Ended
May 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
GBP (£)
Dec. 31, 2018
EUR (€)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
Notional amount   $ 0 $ 0              
Unrealized gain (loss) on derivatives     0 $ (28,000,000)            
Reclassification adjustment for gains (losses) included in net earnings   (2,000,000)                
Derivative liability fair value     1,000,000              
Currency forward contract                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
Gain from settlement of derivative contract   14,000,000                
Currency forward contract | Net Investment Hedging                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
Notional amount         € 10,509,000,000 £ 864,000,000        
Gain (loss) on net investment hedge   (229,000,000) 59,000,000 (63,000,000)            
Cross currency swap | Net Investment Hedging                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
Notional amount         € 2,006,000,000 £ 1,536,000,000        
Interest rate swap                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
Reclassification adjustment for gains (losses) included in net earnings   (2,000,000)                
Interest rate swap | Cash Flow Hedge                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
Notional amount             $ 500,000,000 € 1,500,000,000 £ 500,000,000  
Payments for the settlement of derivatives classified as hedging $ 17,000,000                  
Unrealized gain (loss) on derivatives   $ (17,000,000) 0 0            
Gain (loss) reclassified from accumulated other comprehensive earnings into income     (1,000,000) $ (1,000,000)            
Interest rate swap | Cash Flow Hedge | Minimum                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
Estimated period to transfer derivative OCI to interest expense   4 years                
Interest rate swap | Cash Flow Hedge | Maximum                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
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 [Line Items]                    
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 [Line Items]                    
Derivative asset fair value   $ 10,000,000                
Interest rate swap | Net Investment Hedging                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                    
Derivative asset fair value     $ 2,000,000              
Derivative liability fair value   $ 167,000,000