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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Principal Plans
Fair value of plan assets	$ 2,936	$ 3,312
Principal Plans | Fair Value, Inputs, Level 1
Fair value of plan assets	230	638
Principal Plans | Fair Value, Inputs, Level 2
Fair value of plan assets	225
Principal Plans | Fair Value, Inputs, Level 3
Fair value of plan assets	347	334
Principal Plans | Cash and Cash Equivalents
Fair value of plan assets	15	28
Principal Plans | Cash and Cash Equivalents | Net Asset Value or Its Equivalent
Fair value of plan assets	45	24
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1
Fair value of plan assets	15	28
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 2
Fair value of plan assets	0
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 3
Fair value of plan assets	0	0
Principal Plans | U.S. government and municipals
Fair value of plan assets	161	522
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent
Fair value of plan assets	479	150
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1
Fair value of plan assets	145	522
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2
Fair value of plan assets	16
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 3
Fair value of plan assets	0	0
Principal Plans | U.S. corporate debt
Fair value of plan assets	196
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent
Fair value of plan assets	593	686
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 1
Fair value of plan assets	0
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 2
Fair value of plan assets	196
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 3
Fair value of plan assets	0
Principal Plans | International bonds
Fair value of plan assets	13
Principal Plans | International bonds | Net Asset Value or Its Equivalent
Fair value of plan assets	494	665
Principal Plans | International bonds | Fair Value, Inputs, Level 1
Fair value of plan assets	0
Principal Plans | International bonds | Fair Value, Inputs, Level 2
Fair value of plan assets	13
Principal Plans | International bonds | Fair Value, Inputs, Level 3
Fair value of plan assets	0
Principal Plans | U.S. Equity
Fair value of plan assets	30	41
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 1
Fair value of plan assets	30	41
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 2
Fair value of plan assets	0
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 3
Fair value of plan assets	0	0
Principal Plans | International Equity
Fair value of plan assets	31	47
Principal Plans | International Equity | Fair Value, Inputs, Level 1
Fair value of plan assets	31	47
Principal Plans | International Equity | Fair Value, Inputs, Level 2
Fair value of plan assets	0
Principal Plans | International Equity | Fair Value, Inputs, Level 3
Fair value of plan assets	0	0
Principal Plans | Non-U.S. Equity | Net Asset Value or Its Equivalent
Fair value of plan assets	73	85
Principal Plans | Global equity | Net Asset Value or Its Equivalent
Fair value of plan assets	448	730
Principal Plans | Insurance Contract
Fair value of plan assets	347	334
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 1
Fair value of plan assets	0	0
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 2
Fair value of plan assets	0
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3
Fair value of plan assets	347	334
Principal Plans | Other
Fair value of plan assets	11
Principal Plans | Other | Fair Value, Inputs, Level 1
Fair value of plan assets	9
Principal Plans | Other | Fair Value, Inputs, Level 2
Fair value of plan assets	0
Principal Plans | Other | Fair Value, Inputs, Level 3
Fair value of plan assets	0
Defined Benefit Pension Plans
Fair value of plan assets	$ 3,398	$ 3,897	$ 3,534

X

- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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