Debt (Schedule of Balances Available for Borrowings)(Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Borrowings outstanding	[1]	$ 30
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings outstanding		0
Letters of credit issued		0
Available for borrowing		900
Maximum borrowing base		900	$ 900
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Repayments of Lines of Credit		15
Borrowings outstanding	[2]	30
Letters of credit issued		74
Available for borrowing		16
Total borrowing base		120
Maximum borrowing base	[3]	135
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers		$ 173

[1] The weighted average interest rate was 0.7% as of June 30, 2015 and December 31, 2014.

[2] The Company repaid $15 million of borrowings outstanding during the six months ended June 30, 2015.

[3] Outstanding accounts receivable transferred by the Originators to the Transferor was $173 million.