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Leases (Schedule of Right-of-use Assets and Lease Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Noncurrent Assets Right-of-use assets, finance lease
Right-of-use assets, finance lease $ 211 $ 220
Finance lease liabilities:    
Finance Lease, Liability, Current Other Current Liabilities [Member] Current lease liabilities, finance lease
Current lease liabilities, finance lease [1] $ 8 $ 8
Finance Lease, Liability, Noncurrent Other Long-Term Liabilities [Member] Long-term lease liabilities, finance lease
Long-term lease liabilities, finance lease $ 247 $ 244
Finance Lease, Liability us-gaap:OtherLiabilitiesMember Total lease liabilities, finance lease
Total lease liabilities, finance lease $ 255 $ 252
Operating Lease, Right-of-Use Asset Other Noncurrent Assets Right-of-use assets, operating lease
Right-of-use assets, operating lease $ 24 $ 3
Operating lease liabilities:    
Operating Lease, Liability, Current Other current liabilities Other current liabilities
Current lease liabilities, operating lease [1] $ 18 $ 1
Operating Lease, Liability, Noncurrent Other long-term liabilities Other long-term liabilities
Long-term lease liabilities, operating lease $ 5 $ 2
Operating Lease, Liability, Noncurrent us-gaap:OtherLiabilities us-gaap:OtherLiabilities
Total lease liabilities, operating lease $ 23 $ 3
Right-of-use assets 235 223
Lease liabilities:    
Current lease liabilities [1] 26 9
Long-term lease liabilities 252 246
Total lease liabilities $ 278 $ 255
[1] Current lease liabilities are included in other current liabilities on the consolidated balance sheets.