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Short And Long-Term Debt Unsecured Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2016
Sep. 30, 2016
May 26, 2016
Mar. 01, 2016
Dec. 31, 2015
Debt Instrument [Line Items]          
Long-Term Debt, Gross [1]   $ 3,779      
Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Proceeds from Issuance of Debt $ 400        
Senior Notes | 4.50% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate   4.50%      
Long-Term Debt, Gross   $ 450     $ 450
Senior Notes | 5.25% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate   5.25%      
Long-Term Debt, Gross   $ 550   $ 300 300
Senior Notes | 4.875% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate   4.88%      
Long-Term Debt, Gross   $ 500     0
Face amount of debt     $ 500    
Senior Notes | 3.375% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate   3.375%      
Long-Term Debt, Gross   $ 0     $ 500
Repayments of Subordinated Debt $ 500        
Senior Notes | Additional 5.25% Senior Notes          
Debt Instrument [Line Items]          
Long-Term Debt, Gross       $ 250  
[1] Not included in this table, the Company had $128 million of outstanding letters of credit at September 30, 2016 under the Unsecured Letter of Credit Facility with a weighted average rate of 3.10%. In the second quarter of 2016, the Company moved outstanding letters of credit to the Unsecured Letter of Credit Facility and terminated the synthetic letter of credit facility. As a result, the Company increased the capacity under the Unsecured Letter of Credit Facility by $47 million to $135 million.