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Finance Receivables and Loans, Net (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment |  |  |  | $ 111 |  | $ 111 |
Financing receivable, allowance for credit losses, collectively evaluated for impairment |  |  |  | 1,171 |  | 1,171 |
Loans and leases receivable, gross |  | $ 118,234 |  | 129,210 | $ 118,234 | 129,210 | $ 128,231
Financing receivable, individually evaluated for impairment |  |  |  | 912 |  | 912 |
Financing receivable, collectively evaluated for impairment |  |  |  | 128,298 |  | 128,298 |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | $ (1,263) | (3,245) | $ (1,263) | (1,288) | (1,263) | (1,242) |
Allowance for loan and lease losses, charge-offs |  | (291) |  | (318) | (675) | (678) |
Allowance for loan and lease losses, recoveries |  | 113 |  | 136 | 231 | 259 |
Allowance for loan and lease losses, net charge-offs |  | (178) |  | (182) | (444) | (419) |
Provision for loan losses |  | 287 |  | 177 | 1,190 | 459 |
Allowance for Loan and Lease Losses, Adjustments, Other |  | 0 |  | (1) | (1) | 0 |
Allowance for loan losses | (2,609) | (3,354) | (3,245) | (1,282) | (3,354) | (1,282) |
Provision for credit losses |  | 287 |  | 177 | 1,190 | 459 |
Additional provision expense due to COVID 19 |  |  |  |  |  |  |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Provision for credit losses |  | 128 | 602 |  |  |  |
Consumer portfolio segment |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans and leases receivable, gross |  | 90,365 |  |  | 90,365 |  | 89,924
Consumer portfolio segment | Automotive loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment |  |  |  | 42 |  | 42 |
Financing receivable, allowance for credit losses, collectively evaluated for impairment |  |  |  | 1,036 |  | 1,036 |
Loans and leases receivable, gross |  | 72,712 |  | 72,898 | 72,712 | 72,898 | 72,390
Financing receivable, individually evaluated for impairment |  |  |  | 496 |  | 496 |
Financing receivable, collectively evaluated for impairment |  |  |  | 72,402 |  | 72,402 |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | (1,075) | (2,833) | (1,075) | (1,070) | (1,075) | (1,048) |
Allowance for loan and lease losses, charge-offs |  | (245) |  | (301) | (618) | (653) |
Allowance for loan and lease losses, recoveries |  | 108 |  | 129 | 219 | 247 |
Allowance for loan and lease losses, net charge-offs |  | (137) |  | (172) | (399) | (406) |
Provision for loan losses |  | 269 |  | 180 | 954 | 437 |
Allowance for Loan and Lease Losses, Adjustments, Other |  | (2) |  | 0 | (1) | (1) |
Allowance for loan losses | (2,409) | (2,963) | (2,833) | (1,078) | (2,963) | (1,078) |
Consumer portfolio segment | Real estate-backed loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment |  |  |  | 20 |  | 20 |
Financing receivable, allowance for credit losses, collectively evaluated for impairment |  |  |  | 29 |  | 29 |
Loans and leases receivable, gross |  | 17,413 |  | 17,800 | 17,413 | 17,800 | 17,322
Financing receivable, individually evaluated for impairment |  |  |  | 220 |  | 220 |
Financing receivable, collectively evaluated for impairment |  |  |  | 17,580 |  | 17,580 |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | (46) | (39) | (46) | (52) | (46) | (53) |
Allowance for loan and lease losses, charge-offs |  | (2) |  | (5) | (5) | (8) |
Allowance for loan and lease losses, recoveries |  | 4 |  | 7 | 9 | 12 |
Allowance for loan and lease losses, net charge-offs |  | 2 |  | 2 | 4 | 4 |
Provision for loan losses |  | 1 |  | (5) | (2) | (8) |
Allowance for Loan and Lease Losses, Adjustments, Other |  | 0 |  | 0 | 0 | 0 |
Allowance for loan losses | (40) | (42) | (39) | (49) | (42) | (49) |
Consumer portfolio segment | Other |  |  |  |  |  |  |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | (9) | (45) | (9) |  | (9) |  |
Allowance for loan and lease losses, charge-offs |  | (4) |  |  | (9) |  |
Allowance for loan and lease losses, recoveries |  | 0 |  |  | 1 |  |
Allowance for loan and lease losses, net charge-offs |  | (4) |  |  | (8) |  |
Provision for loan losses |  | 6 |  |  | 31 |  |
Allowance for Loan and Lease Losses, Adjustments, Other |  | 2 |  |  | 1 |  |
Allowance for loan losses | (25) | (49) | (45) |  | (49) |  |
Commercial portfolio segment |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment |  |  |  | 49 |  | 49 |
Financing receivable, allowance for credit losses, collectively evaluated for impairment |  |  |  | 106 |  | 106 |
Loans and leases receivable, gross |  | 27,869 |  | 38,512 | 27,869 | 38,512 | 38,307
Financing receivable, individually evaluated for impairment |  |  |  | 196 |  | 196 |
Financing receivable, collectively evaluated for impairment |  |  |  | 38,316 |  | 38,316 |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | (133) | (328) | (133) | (166) | (133) | (141) |
Allowance for loan and lease losses, charge-offs |  | (40) |  | (12) | (43) | (17) |
Allowance for loan and lease losses, recoveries |  | 1 |  | 0 | 2 | 0 |
Allowance for loan and lease losses, net charge-offs |  | (39) |  | (12) | (41) | (17) |
Provision for loan losses |  | 11 |  | 2 | 207 | 30 |
Allowance for Loan and Lease Losses, Adjustments, Other |  | 0 |  | (1) | (1) | 1 |
Allowance for loan losses | (135) | (300) | $ (328) | $ (155) | (300) | $ (155) |
Commercial portfolio segment | Automotive loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans and leases receivable, gross |  | 17,755 |  |  | 17,755 |  | 28,332
Commercial portfolio segment | Real estate-backed loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans and leases receivable, gross |  | $ 4,799 |  |  | $ 4,799 |  | $ 4,961
Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for Loan and Lease Losses, Adjustments, Other | 1,300 |  |  |  |  |  |
Accounting Standards Update 2016-13 | Retained Earnings |  |  |  |  |  |  |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | (1,346) |  |  |  |  |  |
Accounting Standards Update 2016-13 | Retained Earnings | Consumer portfolio segment | Automotive loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | (1,334) |  |  |  |  |  |
Accounting Standards Update 2016-13 | Retained Earnings | Consumer portfolio segment | Real estate-backed loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | 6 |  |  |  |  |  |
Accounting Standards Update 2016-13 | Retained Earnings | Consumer portfolio segment | Other |  |  |  |  |  |  |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | (16) |  |  |  |  |  |
Accounting Standards Update 2016-13 | Retained Earnings | Commercial portfolio segment |  |  |  |  |  |  |
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Allowance for loan losses | $ (2) |  |  |  |  |  |

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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