Leases Lessor, Underlying Assets Subject Operaing Leases (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019		Jun. 30, 2019		Dec. 31, 2018
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Gross	[1]	$ 1,632		$ 1,632
Property Subject to or Available for Operating Lease, Accumulated Depreciation	[1]	(554)		(554)
Property Subject to or Available for Operating Lease, Net	[2]	1,078	[1],[3]	1,078	[1],[3]	$ 1,205
Land and Building [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Gross	[1],[4]	125		125
Equipment [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Gross	[1]	1,507		1,507
Property Subject to Operating Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Depreciation		$ 35		$ 71
Land and Building [Member] | Property Subject to Operating Lease [Member] | Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property, Plant and Equipment, Useful Life				15 years
Land and Building [Member] | Property Subject to Operating Lease [Member] | Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property, Plant and Equipment, Useful Life				20 years
Equipment [Member] | Property Subject to Operating Lease [Member] | Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property, Plant and Equipment, Useful Life				2 years
Equipment [Member] | Property Subject to Operating Lease [Member] | Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property, Plant and Equipment, Useful Life				30 years

[1] Excludes owned assets subject to operating leases that are held and used by the Company and which are included in Premises, property, and equipment, net, on the Company's Consolidated Balance Sheets.

[2] See Note 10, “Leases,” for additional information.

[3] Included in Other Assets on the Company's Consolidated Balance Sheets.

[4] Includes certain land assets subject to operating leases that have indefinite lives.