Employee Benefit Plans (Obligations and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Change in benefit obligations:
Benefit obligations at January 1,	$ 12,182	$ 12,873
Service costs	187	215	$ 226
Interest costs	328	342	363
Plan participants’ contributions	0	0
Plan amendments	8	1
Net actuarial (gains) losses	(2,609)	(363)
Acquisition, divestitures, settlements and curtailments	(45)	(111)
Benefits paid	(630)	(665)
Effect of foreign currency translation	(123)	(110)
Benefit obligations at December 31,	9,298	12,182	12,873
Change in plan assets
Estimated fair value of plan assets at January 1,	10,971	11,256
Actual return on plan assets	(2,095)	310
Acquisition, divestitures and settlements	(38)	(35)
Plan participants’ contributions	0	0
Employer contributions	152	163
Benefits paid	(630)	(665)
Effect of foreign currency translation	(66)	(58)
Estimated fair value of plan assets at December 31,	8,294	10,971	11,256
Over (under) funded status at December 31,	(1,004)	(1,211)
Amounts recognized in the consolidated balance sheets
Other assets	428	640
Other liabilities	(1,432)	(1,851)
Net amount recognized	(1,004)	(1,211)
Accumulated other comprehensive (income) loss:
Net actuarial (gains) losses	2,277	2,416
Prior service costs (credit)	(36)	(55)
AOCI, before income tax	2,241	2,361
Accumulated benefit obligation	9,185	11,934
Other Postretirement Benefits
Change in benefit obligations:
Benefit obligations at January 1,	1,138	1,252
Service costs	4	4	5
Interest costs	34	37	42
Plan participants’ contributions	32	32
Plan amendments	0	0
Net actuarial (gains) losses	(289)	(96)
Acquisition, divestitures, settlements and curtailments	0	8
Benefits paid	(125)	(99)
Effect of foreign currency translation	0	0
Benefit obligations at December 31,	794	1,138	1,252
Change in plan assets
Estimated fair value of plan assets at January 1,	1,443	1,492
Actual return on plan assets	(43)	14
Acquisition, divestitures and settlements	0	(1)
Plan participants’ contributions	32	32
Employer contributions	(3)	5
Benefits paid	(125)	(99)
Effect of foreign currency translation	(1)	0
Estimated fair value of plan assets at December 31,	1,303	1,443	$ 1,492
Over (under) funded status at December 31,	509	305
Amounts recognized in the consolidated balance sheets
Other assets	796	788
Other liabilities	(287)	(483)
Net amount recognized	509	305
Accumulated other comprehensive (income) loss:
Net actuarial (gains) losses	(498)	(332)
Prior service costs (credit)	0	0
AOCI, before income tax	(498)	(332)
Changes to financial assumptions [Member] | Pension Benefits
Change in benefit obligations:
Net actuarial (gains) losses	(2,600)	(389)
Changes to financial assumptions [Member] | Other Postretirement Benefits
Change in benefit obligations:
Net actuarial (gains) losses	(276)	(34)
Changes to demographic assumptions [Member] | Pension Benefits
Change in benefit obligations:
Net actuarial (gains) losses		0
Changes to demographic assumptions [Member] | Other Postretirement Benefits
Change in benefit obligations:
Net actuarial (gains) losses		(4)
Changes to Plan Experience [Member] | Pension Benefits
Change in benefit obligations:
Net actuarial (gains) losses	14	26
Changes to Plan Experience [Member] | Other Postretirement Benefits
Change in benefit obligations:
Net actuarial (gains) losses	$ (13)	$ (58)