Total Equity and Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, Beginning Balance	$ 47,688.0	$ 54,685.0	$ 55,726.0	$ 54,041.0
Other comprehensive income (loss), net of tax	(2,128.0)	(384.0)	(10,895.0)	(1,691.0)
Equity, Ending Balance	46,723.0	56,297.0	46,723.0	56,297.0
Pretax loss included in AOCI from derivatives	(132.0)		(132.0)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, Beginning Balance	(8,358.0)	1,463.0	409.0	2,770.0
Other comprehensive income (loss), net of tax	(2,128.0)	(384.0)	(10,895.0)	(1,691.0)
Equity, Ending Balance	(10,486.0)	1,079.0	(10,486.0)	1,079.0
Debt securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, Beginning Balance	(6,313.0)	1,584.0	589.0	2,462.0
Other comprehensive income (loss), net of tax	(1,328.0)	(246.0)	(8,230.0)	(1,124.0)
Equity, Ending Balance	(7,641.0)	1,338.0	(7,641.0)	1,338.0
Cash flow hedge derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, Beginning Balance	(2,081.0)	236.0	(201.0)	659.0
Other comprehensive income (loss), net of tax	(783.0)	(133.0)	(2,663.0)	(556.0)
Equity, Ending Balance	(2,864.0)	103.0	(2,864.0)	103.0
Pension and  other postretirement benefit plan adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, Beginning Balance	74.0	(355.0)	27.0	(345.0)
Other comprehensive income (loss), net of tax	1.0	2.0	48.0	(8.0)
Equity, Ending Balance	75.0	(353.0)	75.0	(353.0)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Equity, Beginning Balance	(38.0)	(2.0)	(6.0)	(6.0)
Other comprehensive income (loss), net of tax	(18.0)	(7.0)	(50.0)	(3.0)
Equity, Ending Balance	$ (56.0)	$ (9.0)	$ (56.0)	$ (9.0)