Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 1,331	$ 1,486	$ 1,853
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,604	3,410	3,428
Recognition of deferred income	(1,191)	(1,183)	(1,251)
Provision for credit losses	121	(98)	(433)
Amortization of deferred costs	541	575	541
Foreign currency and other adjustments to the carrying value of debt, net	(1,103)	(1,893)	1,767
Net (gain) loss from sale of investments in marketable securities	(21)	25	(47)
Net change in:
Restricted cash	191	23	(532)
Derivative assets	12	832	(317)
Other assets (Note 8) and accrued income	37	74	(49)
Deferred income taxes	792	954	1,136
Derivative liabilities	(50)	(136)	(364)
Other liabilities	134	(217)	39
Net cash provided by operating activities	4,398	3,852	5,771
Cash flows from investing activities:
Purchases of investments in marketable securities	(5,279)	(7,696)	(5,695)
Proceeds from sales of investments in marketable securities	385	1,571	1,917
Proceeds from maturities of investments in marketable securities	4,261	6,355	1,517
Acquisitions of finance receivables	(25,604)	(22,149)	(23,294)
Collections of finance receivables	22,941	22,341	21,765
Net change in wholesale and certain working capital receivables	(1,887)	(267)	(484)
Acquisitions of investments in operating leases	(10,395)	(7,619)	(10,112)
Disposals of investments in operating leases	5,603	5,233	5,479
Advances to affiliates	(5,199)	(3,851)	(2,815)
Repayments from affiliates	5,319	3,451	2,468
Other, net	(31)	(32)	(32)
Net cash used in investing activities	(9,886)	(2,663)	(9,286)
Cash flows from financing activities:
Proceeds from issuance of debt	22,230	20,308	21,879
Payments on debt	(16,929)	(21,824)	(16,096)
Net change in commercial paper	3,349	1,298	469
Advances from affiliates	49	6	33
Repayments to affiliates	(2,061)	(2,006)	(17)
Dividends paid to TFSA	(1,487)	(741)	(266)
Net cash provided by (used in) financing activities	5,151	(2,959)	6,002
Net (decrease) increase in cash and cash equivalents	(337)	(1,770)	2,487
Cash and cash equivalents at the beginning of the period	5,060	6,830	4,343
Cash and cash equivalents at the end of the period	4,723	5,060	6,830
Supplemental disclosures:
Interest paid	1,258	1,591	1,733
Income taxes paid (received), net	21	(112)	35
Non-cash financing:
Capital contribution for stock-based compensation	$ 0	$ 1	$ 0