Significant Accounting Policies (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended	9 Months Ended
Jul. 01, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Contract with Customer, Asset, after Allowance for Credit Loss		$ 6			$ 6	$ 6
Restricted Cash and Cash Equivalents, Current		3			3	4
Allowance for Doubtful Accounts, Premiums and Other Receivables		3			3	$ 3
Cost of sales (exclusive of depreciation and amortization shown below)	$ 0	500	$ 586	$ 1,211	1,514
Selling, general and administrative expense	0	56	61	128	164
Depreciation and amortization	$ 0	$ 47	$ 48	$ 43	$ 143

The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Cost of product sold and service rendered, excluding depreciation, depletion, and amortization.

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The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

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