Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 12,859	$ 17,050
Net change	283	(1,633)
Ending balance	13,378	15,413
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,059)	(158)
Ending balance	(3,776)	(1,791)
Unrealized gains (losses) on investment securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,095)	(95)
Net change	284	(1,631)
Ending balance	(3,811)	(1,726)
Translation adjustments and net investment hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	18	19
Net change	0	1
Ending balance	18	20
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	18	35
Net change	(1)	(5)
Ending balance	17	30
Defined benefit pension plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	(117)
Net change	0	2
Ending balance	$ 0	$ (115)