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Fair value of hedged debt carried at cost which approximates fair value

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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 the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset, deducted from derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Nominal or face amount used to calculate payment on derivative.

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Derivative Financial Instruments and Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Derivative [Line Items]
Debt Carrying Value Fair Value	$ 33,400		$ 33,400		$ 37,500
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(255)	$ 126	(279)	$ (57)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	748		748		1,065
Fair Value of Derivative Liabilities	2,208		2,208		512
Derivative, Notional Amount	76,470		76,470		85,778
Derivative, Collateral, Obligation to Return Cash	147		147		26
Derivative, Collateral, Right to Reclaim Cash	115		115		71
Derivative Asset, Not Offset, Policy Election Deduction	161		161		415
Derivative Liability, Not Offset, Policy Election Deduction	161		161		415
Interest Rate Contract [Member] \| Designated as Hedging Instrument [Member] \| Fair Value Hedging [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	25	100	101	201
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(336)	103	(1,322)	(538)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	385	(87)	1,376	503
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	19,711		19,711		23,893
Interest Rate Contract [Member] \| Designated as Hedging Instrument [Member] \| Currency Swap
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	(6)	(1)	(9)	(4)
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(61)	11	(98)	(39)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	65	(11)	106	33
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	884		884		885
Interest Rate Contract [Member] \| Designated as Hedging Instrument [Member] \| Level 2 [Member] \| Fair Value, Recurring [Member] \| Fair Value Hedging [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	0		0		544
Fair Value of Derivative Liabilities	1,100		1,100		274
Interest Rate Contract [Member] \| Designated as Hedging Instrument [Member] \| Level 2 [Member] \| Fair Value, Recurring [Member] \| Currency Swap
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	0		0		0
Fair Value of Derivative Liabilities	135		135		49
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	89	6	212	(25)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	44,788		44,788		50,060
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Level 2 [Member] \| Fair Value, Recurring [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	651		651		338
Fair Value of Derivative Liabilities	259		259		126
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	27	(44)	25	8
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	4,454		4,454		4,407
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Level 2 [Member] \| Fair Value, Recurring [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	66		66		66
Fair Value of Derivative Liabilities	24		24		2
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	(443)	$ 49	(670)	$ (196)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Derivative, Notional Amount	6,633		6,633		6,533
Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Level 2 [Member] \| Fair Value, Recurring [Member]
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Fair Value of Derivative Assets	31		31		117
Fair Value of Derivative Liabilities	$ 690		$ 690		$ 61