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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Jun. 30, 2019
Loss Contingencies [Line Items]      
Total firm commitments and future debt payments   $ 37,000 $ 41,000
U.K. Newspaper Matters Indemnity      
Loss Contingencies [Line Items]      
Liability related to indemnity   $ 60 $ 50
Profits Participants Litigation      
Loss Contingencies [Line Items]      
Litigation settlement $ 34