Variable Interest Entity Arrangements - Carrying Values of Assets and Liabilities of Subsidiary in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 8,080	$ 6,268	$ 2,198	$ 3,686
Accounts receivable, net	1,274	1,324
Prepaid expenses and other current assets	1,045	959
Total current assets	14,893	12,103
Non-current assets
Other non-current assets	1,373	1,470
Total assets	37,250	34,309
Current liabilities
Accrued liabilities and other	2,825	3,222
Deferred revenue	1,186	1,163
Customer deposits	788	726
Current portion of debt and finance leases	3,217	1,785
Total current liabilities	11,986	10,667
Deferred revenue, net of current portion	1,199	1,207
Debt and finance leases, net of current portion	10,666	11,634
Other long-term liabilities	2,667	2,691
Total liabilities	26,518	26,199
Operating Lease Vehicles [Member]
Non-current assets
Operating lease net	2,527	2,447
Variable Interest Entities (“VIEs”) [Member]
Current assets
Cash and cash equivalents	84	106
Accounts receivable, net	36	27
Prepaid expenses and other current assets	89	100
Total current assets	209	233
Non-current assets
Other non-current assets	163	156
Total assets	6,503	6,602
Current liabilities
Accrued liabilities and other	76	80
Deferred revenue	74	78
Customer deposits	19	9
Current portion of debt and finance leases	660	608
Total current liabilities	829	775
Deferred revenue, net of current portion	247	264
Debt and finance leases, net of current portion	1,511	1,516
Other long-term liabilities	23	22
Total liabilities	2,610	2,577
Variable Interest Entities (“VIEs”) [Member] | Operating Lease Vehicles [Member]
Non-current assets
Operating lease net	1,142	1,183
Variable Interest Entities (“VIEs”) [Member] | Solar Energy Systems [Member]
Non-current assets
Operating lease net	$ 4,989	$ 5,030