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Debt and Credit Facilities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 31, 2017
Line of Credit Facility [Line Items]        
Proceeds from Issuance of Debt $ 3,500      
Commercial Paper 200 $ 0    
Unamortized debt issuance expense 45 24    
Interest expense, debt 228 108 $ 113  
Senior Unsecured Notes 1.800% due 2019 | Subsequent Event        
Line of Credit Facility [Line Items]        
Unsecured Debt       $ 500
Stated interest rate       1.80%
Senior Unsecured Notes 2.00% due 2016        
Line of Credit Facility [Line Items]        
Unsecured Debt $ 0 $ 749    
Stated interest rate 2.00%      
Repayments of debt $ 750      
Commercial Paper        
Line of Credit Facility [Line Items]        
Borrowing Limit Increase $ 250      
Maturities of time deposits 397 days      
Weighted Average Maturity, Commercial Paper 60 days      
Short-term Debt, Weighted Average Interest Rate 0.90%      
Commercial Paper | Maximum        
Line of Credit Facility [Line Items]        
Commercial paper $ 1,500      
Line of Credit        
Line of Credit Facility [Line Items]        
Borrowing Limit Increase 250      
Line of Credit | Maximum        
Line of Credit Facility [Line Items]        
Commercial paper $ 1,500