Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Consumer) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 118,234	$ 128,231	$ 129,210
Consumer portfolio segment
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	90,365	89,924
Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		3,286
Financing receivable, recorded investment, current		86,627
Total finance receivables and loans	90,357	89,913
Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		3,142
Financing receivable, recorded investment, current		69,248
Total finance receivables and loans	72,712	72,390	72,898
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		137
Financing receivable, recorded investment, current		17,185
Total finance receivables and loans	17,413	17,322	$ 17,800
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		76
Financing receivable, recorded investment, current		16,105
Total finance receivables and loans	16,429	16,181
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		61
Financing receivable, recorded investment, current		1,080
Total finance receivables and loans	984	1,141
Consumer portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	240	212
Loans receivable, fair value	8	11
Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		7
Financing receivable, recorded investment, current		194
Total finance receivables and loans	232	201
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		2,269
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		2,185
Total finance receivables and loans	1,396
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		81
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		56
Total finance receivables and loans	83
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		25
Total finance receivables and loans	12
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	1
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		3
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		611
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		590
Total finance receivables and loans	444
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		19
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		11
Total finance receivables and loans	12
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		8
Total finance receivables and loans	4
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	2
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		2
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		406
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		367
Total finance receivables and loans	509
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		37
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		9
Total finance receivables and loans	10
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		28
Total finance receivables and loans	23
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 1
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		$ 2