Employee Benefit Plans (Pension and Postretirement Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Plan amendments				$ 2,100
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits		87.00%	86.00%
Percentage Of Projected Benefit Obligation Comprised Of Foreign Plan Benefits		10.00%	11.00%
Defined Benefit Plan, Accumulated Benefit Obligation		$ 48,800	$ 66,500
Fair value of plan assets		47,960	63,323
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 1,650	$ 1,885	1,649
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	$ 0
Net settlement and curtailment gain (loss)		$ 3	$ 0	$ (1)
Expected return on plan assets, net cost		5.70%	5.70%	5.70%
Fair value of plan assets		$ 302	$ 389	$ 381
Other Postretirement Benefits Plan [Member] | Asset Held in Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		105	147
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan amendments		131	59
Net settlement and curtailment gain (loss)		$ (2)	$ (22)	$ (45)
Expected return on plan assets, net cost		6.50%	6.50%	6.50%
Derivative, Fair Value, Net		$ (79)	$ 98
Fair value of plan assets		$ 47,960	63,323	$ 62,318
Pension Plan [Member] | Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets, net cost	7.10%
Pension Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Range Of Growth Seeking Assets In Company's Overall Investment Strategy		45.00%
Range Of Income Generating Assets In Company's Overall Investment Strategy		60.00%
Percentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge		80.00%
Pension Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Range Of Growth Seeking Assets In Company's Overall Investment Strategy		40.00%
Range Of Income Generating Assets In Company's Overall Investment Strategy		55.00%
Percentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge		40.00%
VEBA [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 0	$ 0