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Leases (Schedule of Right-of-use Assets and Lease Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
Right-of-use assets, finance lease $ 214 $ 220
Finance lease liabilities:    
Current lease liabilities, finance lease [1] 8 8
Long-term lease liabilities, finance lease 246 244
Total lease liabilities, finance lease 254 252
Right-of-use assets, operating lease 30 3
Operating lease liabilities:    
Current lease liabilities, operating lease [1] 20 1
Long-term lease liabilities, operating lease 10 2
Total lease liabilities, operating lease 30 3
Right-of-use assets 244 223
Lease liabilities:    
Current lease liabilities [1] 28 9
Long-term lease liabilities 256 246
Total lease liabilities $ 284 $ 255
[1] Current lease liabilities are included in other current liabilities on the consolidated balance sheets.