Acquisitions and Dispositions (Divestitures, Major Classes of Assets and Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges	$ 21	$ 93	$ 0
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges	21	52
Cash and cash equivalents	13	20
Receivables	0	5
Inventories	0	5
Assets held for sale	13	30
Accounts payable and accrued liabilities	13	14
Operating lease liabilities	5	6
Deferred income taxes	2	3
Other liabilities	1	1
Liabilities held for sale	$ 21	$ 24