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Employee Benefits - Plans ABO in Excess of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
ABO	$ 922	$ 965
Cash Balance Pension Plan
Defined Benefit Plan Disclosure [Line Items]
PBO	793	828
ABO	793	828
Fair value of plan assets	827	886
Other Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
PBO	128	137
ABO	128	137
Fair value of plan assets	$ 0	$ 0

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

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-Topic 715
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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