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Long-term Financing and Sales of Receivables (Proceeds Received From Non-Recourse Sales Of Accounts Receivable And Long-Term Receivables) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]      
Accounts receivable sales proceeds $ 51 $ 29 $ 50
Long-term receivables sales proceeds 289 196 124
Total proceeds from receivable sales $ 340 $ 225 $ 174