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Short And Long-Term Debt Senior Secured Credit Facility (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Feb. 28, 2018
Jan. 31, 2017
Jul. 31, 2016
Mar. 05, 2013
Debt Instrument [Line Items]            
Long-term debt principal amount [1] $ 3,995          
Letter of Credit, borrowing capacity $ 125          
Additional Credit Facilities           $ 500
Maximum | Required Covenant Ratio to Receive Additional Credit Facilities            
Debt Instrument [Line Items]            
Senior secured leverage ratio 3.50          
Ratio of Indebtedness to Net Capital Denominator 1.00          
Maximum | Required Covenant Ratio            
Debt Instrument [Line Items]            
Senior secured leverage ratio 4.75          
Ratio of Indebtedness to Net Capital Denominator 1.00          
LIBOR            
Debt Instrument [Line Items]            
Description of variable interest rate basis LIBOR          
ABR            
Debt Instrument [Line Items]            
Description of variable interest rate basis ABR          
Term Loan B | LIBOR            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 2.25%          
Debt Instrument, Basis Spread on Variable Rate, Floor 0.75%          
Term Loan B | ABR            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.25%          
Debt Instrument, Basis Spread on Variable Rate, Floor 1.75%          
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity $ 1,425 [2],[3]   $ 1,400 $ 1,050    
Line of Credit Facility, Increase (Decrease), Net [2],[3] $ 25          
Line of Credit | Revolving Credit Facility | LIBOR | Greater than 3.50 to 1.00            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 2.50%          
Line of Credit | Revolving Credit Facility | LIBOR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 2.25%          
Line of Credit | Revolving Credit Facility | LIBOR | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 2.00%          
Line of Credit | Revolving Credit Facility | LIBOR | Less than 2.00 to 1.00            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.75%          
Line of Credit | Revolving Credit Facility | ABR | Greater than 3.50 to 1.00            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.50%          
Line of Credit | Revolving Credit Facility | ABR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.25%          
Line of Credit | Revolving Credit Facility | ABR | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.00%          
Line of Credit | Revolving Credit Facility | ABR | Less than 2.00 to 1.00            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 0.75%          
Secured Debt | Term Loan B            
Debt Instrument [Line Items]            
Repurchased amount of debt         $ 1,100  
Long-term debt principal amount $ 1,067 [4] $ 1,069 $ 1,080      
Annual percentage of original principal amount for quarterly amortization payments 1.00%          
[1] Not included in this table is the Company's Unsecured Letter of Credit Facility which had a capacity of $66 million with $59 million utilized at a weighted average rate of 3.33% at March 31, 2019.
[2] As of March 31, 2019, the Company had $1,425 million of borrowing capacity under its Revolving Credit Facility. The Revolving Credit Facility expires in February 2023 but is classified on the balance sheet as current due to the revolving nature and terms and conditions of the facility. In March 2019, the Company increased the borrowing capacity under its Revolving Credit Facility to $1,425 million from $1,400 million. On April 30, 2019, the Company had $470 million in outstanding borrowings under the Revolving Credit Facility.
[3] Interest rates with respect to revolving loans under the Senior Secured Credit Facility at March 31, 2019 were based on, at the Company's option, (a) adjusted London Interbank Offering Rate ("LIBOR") plus an additional margin or (b) JP Morgan Chase Bank, N.A.'s prime rate ("ABR") plus an additional margin, in each case subject to adjustment based on the then current senior secured leverage ratio. Based on the previous quarter's senior secured leverage ratio, the LIBOR margin was 2.25% and the ABR margin was 1.25% for the three months ended March 31, 2019.
[4] The Term Loan B provides for quarterly amortization payments totaling 1% per annum of the original principal amount. The interest rate with respect to term loans under the Term Loan B is based on, at the Company’s option, (a) adjusted LIBOR plus 2.25% (with a LIBOR floor of 0.75%) or (b) ABR plus 1.25% (with an ABR floor of 1.75%).