Leases Lessor (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Lessor Disclosure [Abstract]
Operating Lease, Lease Income	$ 135	$ 153
Variable Lease, Income	11	25
Lease Income	124	$ 128
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, after Year Five	39
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received	48
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Five	2
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Four	2
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Three	2
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Two	2
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One	1
Sales-type and Direct Financing Leases, Lease Receivables, Gross Difference, Amount [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable	22
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	(26)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Lessor, Operating Lease, Payment to be Received, Year One	381
Lessor, Operating Lease, Payment to be Received, Year Two	472
Lessor, Operating Lease, Payment to be Received, Year Three	456
Lessor, Operating Lease, Payment to be Received, Year Four	392
Lessor, Operating Lease, Payment to be Received, Year Five	393
Lessor, Operating Lease, Payment to be Received, after Year Five	1,420
Lessor, Operating Lease, Payments to be Received	3,514
Operating Lease, Risk Strategy, Residual Asset	$ 8,597		$ 8,505