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SHORT-TERM DEBT - Senior Notes (Details) - USD ($)
$ in Millions
Sep. 17, 2019
Aug. 09, 2011
Jul. 13, 2010
Senior Notes 2020      
Short-term Debt [Line Items]      
Issuance date of debt     Jul. 13, 2010
Debt Instrument, Face Amount     $ 500
Percentage Of Face Amount Of Senior Note Instrument Issued     99.54%
Maturity date     Jul. 15, 2020
Fixed interest rate per annum (in hundredths)     5.00%
Debt Instrument, Redemption Period, End Date Sep. 17, 2019    
Early Repayment of Senior Debt $ 500    
Early repayment of senior notes including prepayment penalty 512    
Early repayment of senior notes prepayment penalty 12    
accelerated amortization of interest rate swap gain 4    
Amortization of Debt Issuance Costs and Discounts 1    
Debt Instrument, Increase, Accrued Interest $ 4    
Senior Notes 2020      
Short-term Debt [Line Items]      
Interest Rate Derivatives Terminated Date   August 9, 2011  
Notional Amount Of Terminated Interest Rate Fair Value Hedge Derivatives   $ 500  
Terminated Interest Rate Fair Value Hedge Derivative Assets At Fair Value   $ 34