Revenues and Segment Information, Contract Balances (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract liabilities, included in accrued expenses	$ 67		$ 55
Contract Balances (Textual)
Revenue recognized that was included in contract liabilities as of prior year end	44	$ 53
Receivables from Contracts with Customers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from contracts with customers, included in receivables, net	$ 5,597		$ 3,642