Employee Benefit Plans (Narrative) (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]
Qualified Pension Plan	80.00%
Pension Benefit Percent Allocation Traditional	62.00%
Pension Benefit Percent Allocation Cash Balance	38.00%
Percentage of annual salary Contributed by the Company for employees (401(k) plans)	4.00%
General And Administrative Expense
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost	$ 79	$ 77	$ 80
Other liabilities
Defined Benefit Plan Disclosure [Line Items]
Net accumulated liability for non-retiree postemployment benefits provided to former or inactive employee	27	30
Rabbi Trust
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Obligation	893	1,026
Fair value of plan assets	118	983
Defined Benefit Plan, Plan Assets, Amount	118	983
Loans, Gross, Insurance Policy	900	0
Rabbi Trust | Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Obligation	57	58
Fair value of plan assets	77	80
Defined Benefit Plan, Plan Assets, Amount	77	80
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Obligation	11,238	11,099	14,787
Fair value of plan assets	$ 12,649	$ 12,519	$ 15,242
Bond Yield rate used in determining Discount rate	5.30%	5.45%	2.85%	2.55%
Expected long-term rate of return on plan assets	7.50%	7.50%	6.00%	5.75%
Defined Benefit Plans Estimated Future Employer Contributions in Next Fiscal Year	$ 180
Defined Benefit Plan, Plan Assets, Amount	12,649	$ 12,519	$ 15,242
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Obligation	1,032	1,348	1,793
Fair value of plan assets	$ 1,186	$ 1,191	$ 1,621
Bond Yield rate used in determining Discount rate	5.20%	5.55%	2.75%	2.40%
Expected long-term rate of return on plan assets	6.75%	7.75%	7.00%	6.75%
Defined Benefit Plans Estimated Future Employer Contributions in Next Fiscal Year	$ 10
Defined Benefit Plan, Plan Assets, Amount	$ 1,186	$ 1,191	$ 1,621
Maximum | Postretirement
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Age	55 years
Deferred Compensation Arrangement with Individual, Requisite Service Period	20 years
Minimum | Postretirement
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Age	50 years
Deferred Compensation Arrangement with Individual, Requisite Service Period	10 years
Foreign plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Weighted Average Asset Allocations	3.00%
Foreign plans | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension benefits for foreign plans percentage of the ending benefit obligation	11.00%	12.00%