Segment and 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
External Revenues	$ 678	$ 673	$ 676	$ 662	$ 642	$ 651	$ 659	$ 643	$ 2,689	$ 2,595	$ 2,673
Profit before income taxes	133	$ 126	$ 164	$ 167	122	$ 146	$ 148	$ 145	590	561	619
Interest Expense									667	611	593
Depreciation on equipment leased to others									810	841	836
Provision for credit losses									132	135	119
Assets	33,160				33,615				33,160	33,615	33,867
Capital expenditures									1,373	1,636	1,461
Operating Segments
Segment Reporting Information
External Revenues									2,630	2,547	2,638
Profit before income taxes									664	620	691
Interest Expense									645	604	600
Depreciation on equipment leased to others									808	838	836
Provision for credit losses									137	138	117
Assets	31,888				32,383				31,888	32,383	32,423
Capital expenditures									1,365	1,627	1,449
Unallocated
Segment Reporting Information
External Revenues									90	80	65
Profit before income taxes									(220)	(138)	(101)
Interest Expense									193	116	67
Depreciation on equipment leased to others									0	0	0
Provision for credit losses									0	0	0
Assets	1,719				1,688				1,719	1,688	1,743
Capital expenditures									8	6	9
Timing
Segment Reporting Information
External Revenues									(31)	(32)	(30)
Profit before income taxes									(6)	(12)	(32)
Interest Expense									0	0	0
Depreciation on equipment leased to others									2	3	0
Provision for credit losses									(5)	(3)	2
Assets	53				27				53	27	164
Capital expenditures									0	3	3
Methodology
Segment Reporting Information
External Revenues									0	0	0
Profit before income taxes									152	91	61
Interest Expense									(171)	(109)	(74)
Depreciation on equipment leased to others									0	0	0
Provision for credit losses									0	0	0
Assets	(256)				(220)				(256)	(220)	(216)
Capital expenditures									0	0	0
Inter-segment Eliminations
Segment Reporting Information
External Revenues									0	0	0
Profit before income taxes									0	0	0
Interest Expense									0	0	0
Depreciation on equipment leased to others									0	0	0
Provision for credit losses									0	0	0
Assets	(244)				(263)				(244)	(263)	(247)
Capital expenditures									0	0	0
North America | Operating Segments
Segment Reporting Information
External Revenues									1,337	1,230	1,156
Profit before income taxes									353	326	370
Interest Expense									306	287	261
Depreciation on equipment leased to others									520	477	409
Provision for credit losses									36	28	7
Assets	14,790				14,925				14,790	14,925	14,419
Capital expenditures									992	1,174	1,118
Europe | Operating Segments
Segment Reporting Information
External Revenues									307	268	284
Profit before income taxes									116	86	96
Interest Expense									37	33	31
Depreciation on equipment leased to others									80	83	76
Provision for credit losses									4	0	3
Assets	4,332				3,834				4,332	3,834	3,758
Capital expenditures									103	147	136
Asia/Pacific | Operating Segments
Segment Reporting Information
External Revenues									267	254	285
Profit before income taxes									99	82	65
Interest Expense									87	81	100
Depreciation on equipment leased to others									25	29	21
Provision for credit losses									(5)	3	29
Assets	4,214				3,620				4,214	3,620	3,923
Capital expenditures									6	74	37
Latin America and CPF | Operating Segments
Segment Reporting Information
External Revenues									447	487	533
Profit before income taxes									47	77	108
Interest Expense									165	156	152
Depreciation on equipment leased to others									41	61	104
Provision for credit losses									94	100	64
Assets	6,153				7,270				6,153	7,270	7,376
Capital expenditures									54	26	89
Mining | Operating Segments
Segment Reporting Information
External Revenues									272	308	380
Profit before income taxes									49	49	52
Interest Expense									50	47	56
Depreciation on equipment leased to others									142	188	226
Provision for credit losses									8	7	14
Assets	$ 2,399				$ 2,734				2,399	2,734	2,947
Capital expenditures									$ 210	$ 206	$ 69