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Accrued Liabilities Table (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities, Current [Abstract]    
Interest on debt $ 288 $ 282
Employee costs 226 205
Estimated rate refund liabilities (Note 19) 189 0
Contract liabilities (Note 2) 158 244
Asset retirement obligation (Note 12) 48 64
Operating lease liabilities (Note 11) 21 0
Other, including other loss contingencies 346 307
Other accrued liabilities $ 1,276 $ 1,102