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Leases (Schedule of Right-of-use Assets and Lease Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
Right-of-use assets, finance lease $ 222 $ 229
Finance lease liabilities:    
Current lease liabilities, finance lease [1] 7 7
Long-term lease liabilities, finance lease 243 240
Total lease liabilities, finance lease 250 247
Right-of-use assets, operating lease 4 14
Operating lease liabilities:    
Current lease liabilities, operating lease [1] 1 10
Long-term lease liabilities, operating lease 2 4
Total lease liabilities, operating lease 3 14
Right-of-use assets 226 243
Lease liabilities:    
Current lease liabilities [1] 8 17
Long-term lease liabilities 245 244
Total lease liabilities $ 253 $ 261
[1] Current lease liabilities are included in other current liabilities on the consolidated balance sheets.