XML 76 R43.htm IDEA: XBRL DOCUMENT v3.8.0.1
Financial Instruments, Derivatives and Hedging Activities Recurring And Nonrecurring (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Fair value of assets and liabilities    
Long-term debt $ 1,600  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1    
Fair value of assets and liabilities    
available for sale securities 10 $ 10
Derivative assets 14 3
Derivative liabilities 3 11
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2    
Fair value of assets and liabilities    
Derivative assets 17 11
Derivative liabilities 22 20
Long-term debt 1,587 1,845
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement    
Fair value of assets and liabilities    
available for sale securities 10 10
Derivative assets 31 14
Derivative liabilities 25 31
Long-term debt $ 1,587 $ 1,845