Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 17,050	$ 14,703	$ 14,416
Net change	(3,901)	(789)	508
Ending balance	12,859	17,050	14,703
Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(158)	631	123
Ending balance	(4,059)	(158)	631
Unrealized gains (losses) on investment securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(95)	640	208
Net change	(4,000)	(735)	432
Ending balance	(4,095)	(95)	640
Translation adjustments and net investment hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	19	19	19
Net change	(1)	0	0
Ending balance	18	19	19
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	35	82	2
Net change	(17)	(47)	80
Ending balance	18	35	82
Defined benefit pension plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(117)	(110)	(106)
Net change	117	(7)	(4)
Ending balance	$ 0	$ (117)	$ (110)