Debt Debt (Accounts Receivable Securitization Facility) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Debt Instrument [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers		$ 161
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Line of Credit, Current	[1]	115	[2]	$ 77
Letters of credit issued		0
Available for borrowing		5
Line of Credit Facility, Current Borrowing Capacity		120
Line of Credit Facility, Maximum Borrowing Capacity	[3]	120
Secured Debt [Member] | Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		112
Repayments of Lines of Credit		$ 74

[1] The weighted average interest rate was 2.4% and 3.1% as of December 31, 2019 and 2018, respectively.

[2] The Company borrowed $112 million and repaid $74 million under this facility during the year ended December 31, 2019

[3] Outstanding accounts receivable transferred to the SPE was $161 million.