Retirement Benefits Estimated Future Benefit Payments (Details 8) $ in Millions	Dec. 31, 2021 USD ($)
Estimated Benefit Payments (Table Amounts) [Abstract]
2022	$ 2,091
2023	2,133
2024	2,161
2025	2,199
2026	2,232
2027 through 2031	11,363
Pension Benefits
Estimated Benefit Payments (Table Amounts) [Abstract]
2022	1,945
2023	1,988
2024	2,039
2025	2,081
2026	2,118
2027 through 2031	10,857
Medical and Life Benefits
Estimated Benefit Payments (Table Amounts) [Abstract]
2022	146
2023	145
2024	122
2025	118
2026	114
2027 through 2031	$ 506

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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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 fifth fiscal year following current fiscal year.

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

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