Employee Benefit Plans (Schedule of Defined Benefit Plan Disclosures) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Plan amendments			$ 2,100
Other	$ 65	$ 23	(51)
Fair value of plan assets	47,960	63,323
Noncurrent liability	(4,807)	(7,855)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations	49,028	67,214	71,257
Service cost	470	523	483
Interest cost	1,520	1,249	1,650
Actuarial loss (gain)	(15,466)	(1,643)
Total benefits paid(1)	(4,328)	(4,098)
Net settlement, curtailment, and special termination benefits	3	(89)
Plan amendments	131	59
Business combinations and divestitures	0	48
Other	(516)	(92)
Fair value of plan assets	47,960	63,323	62,318
Actual return on plan assets	(10,841)	4,983
Employer contributions(1)	306	289
Total benefits paid(1)	(4,328)	(4,098)
Settlements	(4)	(85)
Other (2)	(496)	(84)
Funded status of plan	(1,068)	(3,891)
Noncurrent assets	3,301	3,214
Current liability	(236)	(232)
Noncurrent liability	(4,133)	(6,873)
Net amount recognized	(1,068)	(3,891)
Net actuarial (gain) loss	2,950	4,402
Prior service credit	(1,424)	(1,715)
Net amount recognized	1,526	2,687
Pension Plan [Member] | Continuing operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	470	523
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations	984	1,370	1,535
Service cost	6	7	6
Interest cost	29	24	37
Actuarial loss (gain)	(294)	(73)
Total benefits paid(1)	(166)	(165)
Net settlement, curtailment, and special termination benefits	(8)	(11)
Plan amendments	0	0
Business combinations and divestitures	0	0
Other	47	53
Fair value of plan assets	302	389	$ 381
Actual return on plan assets	(63)	36
Employer contributions(1)	98	95
Total benefits paid(1)	(166)	(165)
Settlements	(8)	(11)
Other (2)	52	53
Funded status of plan	(682)	(981)
Noncurrent assets	0	0
Current liability	(71)	(78)
Noncurrent liability	(611)	(903)
Net amount recognized	(682)	(981)
Net actuarial (gain) loss	(394)	(199)
Prior service credit	(4)	(6)
Net amount recognized	(398)	(205)
Other Postretirement Benefits Plan [Member] | Continuing operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6	$ 7