Cat Financial Financing Activities (Details) - Finance Receivables - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2016	Dec. 31, 2015
Allowance for Credit Loss Activity
Balance at beginning of year	$ 336	$ 398
Receivables written off	(79)	(196)
Recoveries on receivables previously written off	15	41
Provision for credit losses	65	118
Other	7	(25)
Balance at end of period	344	336
Allowance for Credit Losses
Individually evaluated for impairment			$ 69	$ 65
Collectively evaluated for impairment			275	271
Ending Balance	336	398	344	336
Recorded Investment in Finance Receivables
Individually evaluated for impairment			676	601
Collectively evaluated for impairment			22,536	22,358
Ending balance-recorded investment in finance receivables			23,212	22,959
Customer
Allowance for Credit Loss Activity
Balance at beginning of year	327	388
Receivables written off	(79)	(196)
Recoveries on receivables previously written off	15	41
Provision for credit losses	64	119
Other	7	(25)
Balance at end of period	334	327
Allowance for Credit Losses
Individually evaluated for impairment			69	65
Collectively evaluated for impairment			265	262
Ending Balance	327	388	334	327
Recorded Investment in Finance Receivables
Individually evaluated for impairment			676	601
Collectively evaluated for impairment			18,870	18,788
Ending balance-recorded investment in finance receivables			19,546	19,389
Dealer
Allowance for Credit Loss Activity
Balance at beginning of year	9	10
Receivables written off	0	0
Recoveries on receivables previously written off	0	0
Provision for credit losses	1	(1)
Other	0	0
Balance at end of period	10	9
Allowance for Credit Losses
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			10	9
Ending Balance	$ 9	$ 10	10	9
Recorded Investment in Finance Receivables
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			3,666	3,570
Ending balance-recorded investment in finance receivables			$ 3,666	$ 3,570