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Geographic Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Total revenue $ 2,981 $ 2,863 $ 2,802 $ 2,731 $ 2,817 $ 2,796 $ 2,688 $ 2,608 $ 11,377 $ 10,909 $ 9,697
Net property and net investment in operating leases 26,838       27,365       26,838 27,365 25,221
United States                      
Segment Reporting Information [Line Items]                      
Total revenue                 8,378 8,151 7,070
Net property and net investment in operating leases 23,162       24,199       23,162 24,199 22,410
Canada                      
Segment Reporting Information [Line Items]                      
Total revenue                 1,193 1,093 981
Net property and net investment in operating leases 3,302       2,873       3,302 2,873 2,544
All Other                      
Segment Reporting Information [Line Items]                      
Total revenue                 1,806 1,665 1,646
Net property and net investment in operating leases $ 374       $ 293       $ 374 $ 293 $ 267