Derivative Instruments and Hedging Activities (Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, fair value hedge	$ 7,750	$ 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	$ 16,302	$ 11,265
Hedged asset, fair value hedge, cumulative increase (decrease)	(79)	(180)
Closed portfolio and beneficial interest, last-of-layer, amortized cost	14,800	10,000
Amortized cost	14,600	9,700
Basis adjustment for active hedge	(45)	(135)
Hedged asset, last-of-layer, amount	$ 11,300	$ 4,000
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Available-for-sale securities (amortized cost of $28,416 and $34,863)	Available-for-sale securities (amortized cost of $28,416 and $34,863)
Available-for-sale securities | Total derivatives designated as accounting hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Basis adjustment for active hedge	$ 75	$ 3
Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, fair value hedge	54,189	46,390
Hedged asset, fair value hedge, cumulative increase (decrease)	(93)	(617)
Basis adjustment for active hedge	(93)	(617)
Hedged asset, last-of-layer, amount	23,200	22,800
Closed portfolio, carrying value	$ 50,000	$ 46,100
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Finance receivables and loans, net	Finance receivables and loans, net
Finance receivables and loans, net | Total derivatives designated as accounting hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Basis adjustment for active hedge	$ (66)	$ (560)
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, fair value hedge, cumulative increase (decrease)	100	112
Discontinued hedge | Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	(156)	(181)
Basis adjustment for active hedge	(120)	(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)	(27)	(57)
Basis adjustment for active hedge	(27)	(57)
Discontinued hedge | Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, discontinued fair value hedge, cumulative increase (decrease)	$ 100	$ 120