Financial Derivatives (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative [Line Items]
Gain (loss) from components excluded from assessment of net investment hedge effectiveness net			$ 0
Gain (loss) on net investment hedge derivatives	$ 44,000,000	$ 0	(2,000,000)	$ 0
Cash and securities held to collateralize net derivative assets	2,500,000,000		2,500,000,000
Cash and securities pledged to collateralize net derivative liabilities	$ 2,600,000,000		2,600,000,000
Cash flow hedges | Interest Rate Contracts
Derivative [Line Items]
Cash flow hedge loss to be reclassified within twelve months			1,500,000,000
Cash flow hedge loss to be reclassified within twelve months, net of tax			$ 1,100,000,000
Maximum length of time hedged in cash flow hedge			8 years