Leases (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Lessee, Operating Lease, Term of Contract		9 years
Rental expense for leased properties and equipment		$ 81	$ 75	$ 78
Operating Lease, Expense		64
Variable Lease, Cost		19
Sublease Income		2
Right of use assets		$ 329
Lessee, Operating Lease, Discount Rate		3.78%
New Right of Use Assets		$ 49
Operating Lease, Payments		67
Sales-type Lease, Lease Income		14
Sales-type and Direct Financing Leases, Lease Receivable	[1]	$ 369

[1] Excludes net investment in leveraged leases of $219 million.