Employee Benefit Plans (Pension Plans) (Level 3 Significant Unobservable Inputs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance, Plan Assets	$ 63,323
Ending Balance, Plan Assets	47,960	$ 63,323
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance, Plan Assets	1,885	1,649
Realized gains	76	212
Unrealized gains (losses) relating to instruments still held in the reporting period	64	50
Purchases, sales and settlements, net	(211)	(24)
Transfers in/out, net	(164)	(2)
Ending Balance, Plan Assets	1,650	1,885
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance, Plan Assets	18,682
Ending Balance, Plan Assets	12,639	18,682
Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance, Plan Assets	0	2
Realized gains	0	0
Unrealized gains (losses) relating to instruments still held in the reporting period	0	0
Purchases, sales and settlements, net	0	0
Transfers in/out, net	0	(2)
Ending Balance, Plan Assets	0	0
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance, Plan Assets	3,628
Ending Balance, Plan Assets	3,411	3,628
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance, Plan Assets	1,885	1,647
Realized gains	76	212
Unrealized gains (losses) relating to instruments still held in the reporting period	64	50
Purchases, sales and settlements, net	(211)	(24)
Transfers in/out, net	(164)	0
Ending Balance, Plan Assets	$ 1,650	$ 1,885