Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended
	Feb. 20, 2019	Jan. 31, 2019	Mar. 31, 2019	Jun. 30, 2018
Loss Contingencies [Line Items]
Total firm commitments and future debt payments			$ 41,000	$ 32,000
Profits Participants Litigation
Loss Contingencies [Line Items]
Arbitrator award to the plaintiffs	$ 129
U.K. Newspaper Matters Indemnity
Loss Contingencies [Line Items]
Liability related to indemnity			$ 50	$ 50
Senior notes
Loss Contingencies [Line Items]
Net proceeds from issuance of senior notes		$ 6,800