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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Principal Plans
Fair value of plan assets	$ 3,389	$ 3,627
Principal Plans | Fair Value, Inputs, Level 1
Fair value of plan assets	265	277
Principal Plans | Fair Value, Inputs, Level 2
Fair value of plan assets	337	372
Principal Plans | Fair Value, Inputs, Level 3
Fair value of plan assets	355	380
Principal Plans | Cash and Cash Equivalents
Fair value of plan assets	50	56
Principal Plans | Cash and Cash Equivalents | Net Asset Value or Its Equivalent
Fair value of plan assets	26	15
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1
Fair value of plan assets	50	56
Principal Plans | U.S. government and municipals
Fair value of plan assets	166	191
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent
Fair value of plan assets	149	167
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1
Fair value of plan assets	158	171
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2
Fair value of plan assets	8	20
Principal Plans | U.S. corporate debt
Fair value of plan assets	293	310
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent
Fair value of plan assets	646	730
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 1
Fair value of plan assets	7
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 2
Fair value of plan assets	286	310
Principal Plans | International bonds
Fair value of plan assets	43	42
Principal Plans | International bonds | Net Asset Value or Its Equivalent
Fair value of plan assets	1,144	1,062
Principal Plans | International bonds | Fair Value, Inputs, Level 2
Fair value of plan assets	43	42
Principal Plans | U.S. Equity
Fair value of plan assets	17	18
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 1
Fair value of plan assets	17	18
Principal Plans | International Equity
Fair value of plan assets	32	31
Principal Plans | International Equity | Fair Value, Inputs, Level 1
Fair value of plan assets	32	31
Principal Plans | Non-U.S. Equity
Fair value of plan assets	46
Principal Plans | Non-U.S. Equity | Net Asset Value or Its Equivalent
Fair value of plan assets		107
Principal Plans | Global equity
Fair value of plan assets	423
Principal Plans | Global equity | Net Asset Value or Its Equivalent
Fair value of plan assets		517
Principal Plans | Insurance Contract
Fair value of plan assets	355	380
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3
Fair value of plan assets	355	380
Principal Plans | Other
Fair value of plan assets	(1)	1
Principal Plans | Other | Fair Value, Inputs, Level 1
Fair value of plan assets	1	1
Defined Benefit Pension Plans
Fair value of plan assets	$ 3,744	$ 4,193	$ 3,803

X

- Definition

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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