Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 3,182	$ 3,081	$ 3,099	$ 3,020	$ 2,981	$ 2,863	$ 2,802	$ 2,731	$ 12,382	$ 11,377	$ 10,909
Net property and net investment in operating leases	27,641				26,838				27,641	26,838	27,365
United States
Segment Reporting Information [Line Items]
Total revenue									9,043	8,378	8,151
Net property and net investment in operating leases	24,057				23,162				24,057	23,162	24,199
Canada
Segment Reporting Information [Line Items]
Total revenue									1,315	1,193	1,093
Net property and net investment in operating leases	3,155				3,302				3,155	3,302	2,873
All Other
Segment Reporting Information [Line Items]
Total revenue									2,024	1,806	1,665
Net property and net investment in operating leases	$ 429				$ 374				$ 429	$ 374	$ 293