Derivative Instruments and Hedging Activities (Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, fair value hedge	$ 7,708	$ 7,697
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, fair value hedge	$ 11,493	$ 11,265
Hedged asset, fair value hedge, cumulative increase (decrease)	(45)	(180)
Closed portfolio and beneficial interest, last-of-layer, amortized cost	10,000	10,000
Amortized cost	9,700	9,700
Basis adjustment for active hedge	(16)	(135)
Hedged asset, last-of-layer, amount	7,700	4,000
Available-for-sale securities | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Basis adjustment for active hedge	116	3
Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, fair value hedge	52,785	46,390
Hedged asset, fair value hedge, cumulative increase (decrease)	(402)	(617)
Basis adjustment for active hedge	(402)	(617)
Hedged asset, last-of-layer, amount	30,500	22,800
Closed portfolio, carrying value	51,900	46,100
Finance receivables and loans, net | Designated as hedging instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Basis adjustment for active hedge	(355)	(560)
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, fair value hedge, cumulative increase (decrease)	108	112
Discontinued hedge | Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	(174)	(181)
Basis adjustment for active hedge	(132)	(138)
Discontinued hedge | Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	(47)	(57)
Basis adjustment for active hedge	(47)	(57)
Discontinued hedge | Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, discontinued fair value hedge, cumulative increase (decrease)	$ 108	$ 120