Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 3,410	$ 267	$ 932
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,123	6,916	5,965
Recognition of deferred income	(2,003)	(1,779)	(1,713)
Provision for credit losses	401	582	441
Amortization of deferred costs	607	625	620
Foreign currency and other adjustments to the carrying value of debt, net	1,502	(704)	1,195
Net realized gains from sales and other-than-temporary impairment on available-for-sale securities	(41)	(226)	(6)
Gain on sale of commercial finance business	0	0	(197)
Net change in:
Restricted cash and cash equivalents	41	(77)	(226)
Derivative assets	(10)	17	(15)
Other assets and accrued interest	(117)	(167)	66
Deferred income taxes	(2,578)	(3)	531
Derivative liabilities	(40)	39	(83)
Other liabilities	81	347	329
Net cash provided by operating activities	8,376	5,837	7,839
Cash flows from investing activities:
Purchase of investments in marketable securities	(7,137)	(3,702)	(7,447)
Proceeds from sales of investments in marketable securities	1,376	875	914
Proceeds from maturities of investments in marketable securities	5,580	3,656	7,026
Acquisition of finance receivables	(25,713)	(25,497)	(24,956)
Collection of finance receivables	24,100	24,324	24,523
Net change in wholesale and certain working capital receivables	388	(1,859)	(512)
Acquisition of investments in operating leases	(16,575)	(17,947)	(19,917)
Disposals of investments in operating leases	9,821	10,230	8,283
Proceeds from sale of commercial finance business	0	0	2,317
Net change in financing support provided to affiliates	755	354	7
Cash equivalents (restricted) to acquire finance receivables and investment in operating leases, net	(173)	0	0
Other, net	(79)	(110)	(68)
Net cash used in investing activities	(7,657)	(9,676)	(9,830)
Cash flows from financing activities:
Proceeds from issuance of debt	21,768	28,817	25,564
Payments on debt	(23,814)	(23,463)	(22,865)
Net change in commercial paper	664	(12)	(410)
Net change in financing support provided by affiliates	5	(6)	(4)
Net cash (used in) provided by financing activities	(1,377)	5,336	2,285
Net (decrease) increase in cash and cash equivalents	(658)	1,497	294
Cash and cash equivalents at the beginning of the period	4,198	2,701	2,407
Cash and cash equivalents at the end of the period	3,540	4,198	2,701
Supplemental disclosures:
Interest paid, net	1,722	1,406	1,190
Income taxes paid (received), net	$ 8	$ 53	$ (95)