Debt (Schedule of Accounts Receivable Securitization Facility)(Details) - Accounts Receivable Securitization Facility [Member] - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2016		Dec. 31, 2015
Debt Instrument [Line Items]
Borrowings outstanding	[2]	$ 0	[1]	$ 55
Letters of credit issued		52
Available for borrowing		56
Total borrowing base		108
Maximum borrowing base	[3]	120
Repayments of lines of credit		55
Outstanding accounts receivable transferred by the Originators to the Transferor		$ 145

[1] The Company repaid $55 million during the six months ended June 30, 2016.

[2] The weighted average interest rate was 0.8% as of December 31, 2015.

[3] Outstanding accounts receivable transferred to the SPE was $145 million.