Investments (Operating Leases - Narrative) (Details) $ in Millions	Jun. 30, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract]
Operating Leases, Future Minimum Payments Receivable, Current	$ 154
Operating Leases, Future Minimum Payments Receivable, in Two Years	246
Operating Leases, Future Minimum Payments Receivable, in Three Years	193
Operating Leases, Future Minimum Payments Receivable, in Four Years	163
Operating Leases, Future Minimum Payments Receivable, in Five Years	142
Operating Leases, Future Minimum Payments Receivable, Thereafter	992
Operating Leases, Future Minimum Payments Receivable	$ 1,900