Total Equity and Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, beginning balance	$ 54,469	$ 51,141
Other comprehensive income (loss), net of tax	1,328	(330)
Equity, ending balance	56,451	51,374
Pretax loss included in AOCI from derivatives	271	289
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, beginning balance	(6,565)	(7,712)
Other comprehensive income (loss), net of tax	1,328	(330)
Equity, ending balance	(5,237)	(8,042)
Debt securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, beginning balance	(5,099)	(5,830)
Other comprehensive income (loss), net of tax	703	(136)
Equity, ending balance	(4,396)	(5,966)
Cash flow hedge derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, beginning balance	(1,314)	(1,713)
Other comprehensive income (loss), net of tax	625	(190)
Equity, ending balance	(689)	(1,903)
Pension and  other postretirement benefit plan adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, beginning balance	(109)	(125)
Other comprehensive income (loss), net of tax	(1)	(2)
Equity, ending balance	(110)	(127)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, beginning balance	(43)	(44)
Other comprehensive income (loss), net of tax	1	(2)
Equity, ending balance	$ (42)	$ (46)