Derivative Financial Instruments and Hedging Activities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	$ (392)	$ (35)	$ 594
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	987	1,065
Fair Value of Derivative Liabilities	3,026	512
Derivative, Collateral, Obligation to Return Cash	210	26
Derivative, Collateral, Right to Reclaim Cash	193	71
Derivative Asset, Not Offset, Policy Election Deduction	166	415
Derivative, Notional Amount	91,832	85,778
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	390	(3)	(100)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	63,210	50,060
Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	(45)	393	290
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(1,875)	(1,001)	986
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	1,893	957	(985)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	16,883	23,893
Interest Rate Contract [Member] \| Currency Swap [Member] \| Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	(27)	(8)	(2)
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(111)	(93)	38
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	113	82	(37)
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	50	145	(82)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	4,219	4,407
Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(780)	(507)	$ 486
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	6,635	6,533
Cross Currency Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	885	885
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	931	338
Fair Value of Derivative Liabilities	483	126
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	0	544
Fair Value of Derivative Liabilities	1,653	274
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	41	66
Fair Value of Derivative Liabilities	76	2
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	15	117
Fair Value of Derivative Liabilities	653	61
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Cross Currency Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	0	0
Fair Value of Derivative Liabilities	$ 161	$ 49

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Income Effect of Derivative Financial Instruments [Abstract]

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset, subject to master netting arrangement or similar agreement and not elected or qualified to offset, deducted from derivative asset.

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