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Debt (Schedule of Balances Available for Borrowing) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Sep. 26, 2016
Jul. 15, 2016
Dec. 31, 2016
Dec. 31, 2015
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Borrowings outstanding [2] $ 0 [1]     $ 0 [1] $ 350
Letters of credit issued 0     0  
Available for borrowing [3] $ 1,000     1,000  
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Proceeds from Lines of Credit     $ 409 409  
Repayments of Lines of Credit   $ 411   411  
Revolving Credit Facility [Member] | Revolving Credit Facility1 [Member]          
Debt Instrument [Line Items]          
Proceeds from Lines of Credit       245  
Repayments of Lines of Credit       $ 595  
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 1.50%        
[1] The Company borrowed $409 million and repaid $411 million under its new senior unsecured revolving credit facility during the year ended December 31, 2016. The Company borrowed $245 million and repaid $595 million under its previous secured revolving credit facility during the year ended December 31, 2016.
[2] The weighted average interest rate was 1.8% as of December 31, 2015.
[3] The margin for borrowings under the senior unsecured revolving credit facility was 1.5% above LIBOR at current Company credit ratings.