Cat Financial Financing Activities (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Allowance for Credit Loss Activity
Balance at beginning of year	$ 375	$ 423
Receivables written off	(52)	(179)
Recoveries on receivables previously written off	14	56
Provision for credit losses	32	84
Other		(9)
Balance at end of period	369	375
Allowance for Credit Losses
Individually evaluated for impairment	50	70
Collectively evaluated for impairment	319	305
Ending Balance	369	375
Recorded Investment in Finance Receivables
Individually evaluated for impairment	553	628
Collectively evaluated for impairment	23,853	23,433
Ending balance-recorded investment in finance receivables	24,406	24,061
Customer
Allowance for Credit Loss Activity
Balance at beginning of year	365	414
Receivables written off	(52)	(179)
Recoveries on receivables previously written off	14	56
Provision for credit losses	32	83
Other		(9)
Balance at end of period	359	365
Allowance for Credit Losses
Individually evaluated for impairment	50	70
Collectively evaluated for impairment	309	295
Ending Balance	359	365
Recorded Investment in Finance Receivables
Individually evaluated for impairment	553	628
Collectively evaluated for impairment	20,050	19,668
Ending balance-recorded investment in finance receivables	20,603	20,296
Dealer
Allowance for Credit Loss Activity
Balance at beginning of year	10	9
Receivables written off	0	0
Recoveries on receivables previously written off	0	0
Provision for credit losses	0	1
Other		0
Balance at end of period	10	10
Allowance for Credit Losses
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	10	10
Ending Balance	10	10
Recorded Investment in Finance Receivables
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3,803	3,765
Ending balance-recorded investment in finance receivables	$ 3,803	$ 3,765