Investments (Operating Leases - Narrative) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Investments, All Other Investments [Abstract]
Operating Leases, Future Minimum Payments Receivable, Current	$ 288
Operating Leases, Future Minimum Payments Receivable, in Two Years	240
Operating Leases, Future Minimum Payments Receivable, in Three Years	205
Operating Leases, Future Minimum Payments Receivable, in Four Years	186
Operating Leases, Future Minimum Payments Receivable, in Five Years	159
Operating Leases, Future Minimum Payments Receivable, Thereafter	1,100
Operating Leases, Future Minimum Payments Receivable	$ 2,200