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Risk Management - Foreign Currency Risk Management (Details)
$ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Cash Flow Hedging [Member] | Foreign currency contracts    
Derivative [Line Items]    
Derivative, Notional Amount $ 1,358  
Cash Flow Hedging [Member] | 7-yr senior notes    
Derivative [Line Items]    
Debt Instrument, Term 7 years  
Cash Flow Hedging [Member] | 7-yr senior notes | Foreign currency contracts    
Derivative [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.79% 3.79%
Cash Flow Hedging [Member] | 12-yr senior notes    
Derivative [Line Items]    
Debt Instrument, Term 12 years  
Cash Flow Hedging [Member] | 12-yr senior notes | Foreign currency contracts    
Derivative [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.67% 4.67%
Net Investment Hedging [Member] | Foreign currency contracts    
Derivative [Line Items]    
Derivative, Notional Amount $ 1,888 $ 2,450