Debt (Schedule of Accounts Receivable Securitization Facility)(Details) - Accounts Receivable Securitization Facility [Member] - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Jul. 08, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Borrowings outstanding	[1]			$ 55
Secured Debt [Member]
Debt Instrument [Line Items]
Borrowings outstanding	[1],[2]	$ 0
Letters of credit issued		52
Available for borrowing		53
Total borrowing base		105
Maximum borrowing base	[3]	120	$ 120
Repayments of lines of credit		55
Outstanding accounts receivable transferred by the Originators to the Transferor		$ 154

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

[2] The Company repaid $55 million during the nine months ended September 30, 2016.

[3] Outstanding accounts receivable transferred to the SPE was $154 million.