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Debt Debt (Accounts Receivable Securitization Facility) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers $ 185  
Accounts Receivable Securitization Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit, Current [2] 77 [1] $ 80
Letters of credit issued 29  
Available for borrowing 14  
Line of Credit Facility, Current Borrowing Capacity 120  
Line of Credit Facility, Maximum Borrowing Capacity [3] 120  
Secured Debt [Member] | Accounts Receivable Securitization Facility [Member]    
Debt Instrument [Line Items]    
Proceeds from Issuance of Debt 25  
Repayments of Lines of Credit $ 28  
[1] The Company borrowed $25 million and repaid $28 million during the year ended December 31, 2018
[2] The weighted average interest rate was 3.1% and 2.1% as of December 31, 2018 and 2017, respectively.
[3] Outstanding accounts receivable transferred to the SPE was $185 million.