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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Sep. 30, 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 65   $ 50
Profits Participants Litigation      
Loss Contingencies [Line Items]      
Litigation settlement $ 20 $ 34