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, 2021	Dec. 31, 2020
Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, fair value hedge	$ 5,119	$ 1,259
Hedged asset, fair value hedge, cumulative increase (decrease)	(14)	39
Closed portfolio and beneficial interest, last-of-layer, amortized cost	3,900	592
Hedged asset, last-of-layer, amount	1,200
Hedge basis adjustment, last-of-layer increase (decrease)	14
Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, fair value hedge	44,098	28,393
Hedged asset, fair value hedge, cumulative increase (decrease)	(37)	225
Hedged asset, last-of-layer, amount	15,600	9,400
Hedge basis adjustment, last-of-layer increase (decrease)	(82)	153
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, fair value hedge	7,213	8,656
Hedged liability, fair value hedge, cumulative increase (decrease)	110	169
Discontinued hedge | Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	(30)	28
Hedged asset, last-of-layer, amount	8,600	1,200
Hedge basis adjustment, last-of-layer increase (decrease)	(20)	20
Discontinued hedge | Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	46	72
Hedged asset, last-of-layer, amount	20,900	18,500
Hedge basis adjustment, last-of-layer increase (decrease)	46	72
Discontinued hedge | Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged liability, discontinued fair value hedge, cumulative increase (decrease)	$ 110	$ 203