Retirement Benefits Estimated Future Benefit Payments (Details 8) $ in Millions	Dec. 31, 2023 USD ($)
Estimated Benefit Payments (Table Amounts) [Abstract]
2024	$ 2,146
2025	2,195
2026	2,226
2027	2,236
2028	2,254
2029 through 2033	11,275
Pension Benefits
Estimated Benefit Payments (Table Amounts) [Abstract]
2024	2,012
2025	2,058
2026	2,095
2027	2,129
2028	2,151
2029 through 2033	10,820
Medical and Life Benefits
Estimated Benefit Payments (Table Amounts) [Abstract]
2024	134
2025	137
2026	131
2027	107
2028	103
2029 through 2033	$ 455

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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