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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 20, 2019
Jan. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Loss Contingencies [Line Items]        
Total firm commitments     $ 34,000 $ 32,000
U.K. Newspaper Matters Indemnity        
Loss Contingencies [Line Items]        
Liability related to indemnity     $ 45 $ 50
Subsequent Event | Profits Participants Litigation        
Loss Contingencies [Line Items]        
Arbitrator award to the plaintiffs $ 129      
Senior Notes | Subsequent Event        
Loss Contingencies [Line Items]        
Net proceeds from issuance of senior notes   $ 6,800