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Employee Benefit Plans (Fair Values of the Corporation's Qualified Defined Benefit Pension Plan Investments Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair value of plan assets in qualified defined benefit pension plan, Excluding assets valued at net asset value	$ 1,269	$ 1,569
Fair value of plan assets in qualified defined benefit pension plan	2,499	3,454
Debt securities | U.S. Treasury and other U.S. government agency securities
Fair value of plan assets in qualified defined benefit pension plan	534	599
Debt securities | Corporate and municipal bonds and notes
Fair value of plan assets in qualified defined benefit pension plan	676	893
Debt securities | Mortgage-backed secutities
Fair value of plan assets in qualified defined benefit pension plan	20	27
Debt securities | Collective investments funds
Fair value of plan assets in qualified defined benefit pension plan	1,230	1,885
Private placements | Private placements
Fair value of plan assets in qualified defined benefit pension plan	39	50
Level 1
Fair value of plan assets in qualified defined benefit pension plan, Excluding assets valued at net asset value	531	595
Level 1 | Debt securities | U.S. Treasury and other U.S. government agency securities
Fair value of plan assets in qualified defined benefit pension plan	531	595
Level 1 | Debt securities | Corporate and municipal bonds and notes
Fair value of plan assets in qualified defined benefit pension plan	0	0
Level 1 | Debt securities | Mortgage-backed secutities
Fair value of plan assets in qualified defined benefit pension plan	0	0
Level 1 | Private placements | Private placements
Fair value of plan assets in qualified defined benefit pension plan	0	0
Level 2
Fair value of plan assets in qualified defined benefit pension plan, Excluding assets valued at net asset value	699	924
Level 2 | Debt securities | U.S. Treasury and other U.S. government agency securities
Fair value of plan assets in qualified defined benefit pension plan	3	4
Level 2 | Debt securities | Corporate and municipal bonds and notes
Fair value of plan assets in qualified defined benefit pension plan	676	893
Level 2 | Debt securities | Mortgage-backed secutities
Fair value of plan assets in qualified defined benefit pension plan	20	27
Level 2 | Private placements | Private placements
Fair value of plan assets in qualified defined benefit pension plan	0	0
Level 3
Fair value of plan assets in qualified defined benefit pension plan, Excluding assets valued at net asset value	39	50
Level 3 | Debt securities | U.S. Treasury and other U.S. government agency securities
Fair value of plan assets in qualified defined benefit pension plan	0	0
Level 3 | Debt securities | Corporate and municipal bonds and notes
Fair value of plan assets in qualified defined benefit pension plan	0	0
Level 3 | Debt securities | Mortgage-backed secutities
Fair value of plan assets in qualified defined benefit pension plan	0	0
Level 3 | Private placements | Private placements
Fair value of plan assets in qualified defined benefit pension plan	$ 39	$ 50

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- Definition

Total assets at fair value in the fair value hierarchy valued on a nonrecurring basis.

+ References

No definition available.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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