XML 92 R79.htm IDEA: XBRL DOCUMENT v3.8.0.1
Debt and Credit Facility - Term Loan Facilities (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2017
Sep. 30, 2017
Dec. 31, 2017
Term Loan Facilities [Member]      
Debt Instrument [Line Items]      
Long-term Line of Credit   $ 6,000,000,000  
Proceeds from Lines of Credit $ 6,000,000,000    
Debt Instrument, Interest Rate, Stated Percentage     2.50%
Repayments of Lines of Credit     $ 311,000,000
Cash Bridge Facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   9,000,000,000  
Proceeds from Lines of Credit   0  
364-day senior unsecured term loan facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   1,000,000,000.0  
Three-year senior unsecured term loan facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   2,500,000,000.0  
Repayments of Lines of Credit     $ 1,500,000,000
Five-year senior unsecured term loan facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,500,000,000.0