Employee Benefit Plans (Schedule of Defined Benefit Plan Disclosures) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)	$ 425
Plan amendments			$ 2,100
Other		$ 23	(51)	$ (93)
Fair value of plan assets		63,323	62,318
Noncurrent liability		(7,855)	(10,342)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations		67,214	71,257	38,027
Service Cost		523	483	261
Interest cost		1,249	1,650	1,245
Actuarial loss (gain)		(1,643)	7,029
Total benefits paid(1)		(4,098)	(3,623)
Net settlement, curtailment, and special termination benefits		(89)	(4)
Plan amendments		59	(2,088)
Business combinations and divestitures(2)		48	29,385
Other		(92)	397
Fair value of plan assets		63,323	62,318	36,225
Actual return on plan assets		4,983	9,885
Employer contributions(1)		289	1,201
Total benefits paid(1)		(4,098)	(3,623)
Settlements		(85)	(32)
Business combinations and divestitures(2)		0	18,310
Other (3)		(84)	352
Funded status of plan		(3,891)	(8,939)
Noncurrent assets		3,214	424
Current liability		(232)	(232)
Noncurrent liability		(6,873)	(9,131)
Net amount recognized		(3,891)	(8,939)
Net actuarial (gain) loss		4,402	8,023
Prior service credit		(1,715)	(1,947)
Net amount recognized		2,687	6,076
Pension Plan [Member] | Continuing operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost		523	483
Pension Plan [Member] | Discontinued Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost		0	1
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations		1,370	1,535	765
Service Cost		7	6	2
Interest cost		24	37	31
Actuarial loss (gain)		(73)	114
Total benefits paid(1)		(165)	(144)
Net settlement, curtailment, and special termination benefits		(11)	(8)
Plan amendments		0	(7)
Business combinations and divestitures(2)		0	724
Other		53	48
Fair value of plan assets		389	381	$ 20
Actual return on plan assets		36	80
Employer contributions(1)		95	102
Total benefits paid(1)		(165)	(144)
Settlements		(11)	(8)
Business combinations and divestitures(2)		0	286
Other (3)		53	45
Funded status of plan		(981)	(1,154)
Noncurrent assets		0	0
Current liability		(78)	(82)
Noncurrent liability		(903)	(1,072)
Net amount recognized		(981)	(1,154)
Net actuarial (gain) loss		(199)	(117)
Prior service credit		(6)	(9)
Net amount recognized		(205)	(126)
Other Postretirement Benefits Plan [Member] | Continuing operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost		7	6
Other Postretirement Benefits Plan [Member] | Discontinued Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost		$ 0	$ 0