Employee Benefit Plans (Pension and Postretirement Plans) (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Apr. 03, 2020	Aug. 31, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, benefit obligation, (increase) decrease due to remeasurement	$ 2,400
Plan amendments					$ 2,100
Actuarial loss (gain)		$ 425
Net settlement and curtailment gain (loss)		$ 98
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits				86.00%	85.00%
Percentage Of Projected Benefit Obligation Comprised Of Foreign Plan Benefits				11.00%	12.00%
Other pension and PRB related liabilities				$ 79	$ 139
Defined Benefit Plan, Accumulated Benefit Obligation				66,500	70,200
Fair value of plan assets				63,323	62,318
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				$ 1,885	$ 1,649	$ 1,671
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Percent Of Plan Assets Concentrated in Individual Investment				5.00%
Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits				3.00%	3.00%
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Discretionary Pension Contributions					$ 750
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year					51
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments				$ 0	(7)
Actuarial loss (gain)				(73)	114
Net settlement and curtailment gain (loss)				$ 0	$ (1)	$ 0
Expected return on plan assets, net cost				5.70%	5.70%	7.00%
Fair value of plan assets				$ 389	$ 381	$ 20
Other Postretirement Benefits Plan [Member] | Asset Held in Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				147	149
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments				59	(2,088)
Actuarial loss (gain)				(1,643)	7,029
Net settlement and curtailment gain (loss)				$ (22)	$ (45)	$ 59
Expected return on plan assets, net cost				6.50%	6.50%	6.80%
Derivative, Fair Value, Net				$ 98	$ 176
Fair value of plan assets				$ 63,323	62,318	$ 36,225
Pension Plan [Member] | Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets, net cost			6.50%
Pension Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Range Of Growth Seeking Assets In Company's Overall Investment Strategy				55.00%
Range Of Income Generating Assets In Company's Overall Investment Strategy				50.00%
Percentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge				70.00%
Pension Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Range Of Growth Seeking Assets In Company's Overall Investment Strategy				50.00%
Range Of Income Generating Assets In Company's Overall Investment Strategy				45.00%
Percentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge				30.00%
VEBA [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				$ 0	$ 0