Debt (Schedule of Accounts Receivable Securitization Facility) (Details) - Accounts Receivable Securitization Facility [Member] - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Borrowings outstanding	[1]	$ 115	$ 77
Secured Debt [Member]
Debt Instrument [Line Items]
Borrowings outstanding		115
Letters of credit issued		0
Available for borrowing		5
Total borrowing base		120
Maximum borrowing base	[2]	120
Outstanding accounts receivable transferred by the Originators to the Transferor		$ 182

[1] The weighted average interest rate was 2.9% and 3.1% as of September 30, 2019 and December 31, 2018, respectively.

[2] Outstanding accounts receivable transferred to the SPE was $182 million.