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Employee Benefit Plans and Postretirement Benefits - Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial losses	$ 793
Unrecognized prior service credit	3
Accumulated other comprehensive loss	796
Healthcare
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial losses	59
Unrecognized prior service credit	(242)
Accumulated other comprehensive loss	(183)
Other
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial losses	109
Unrecognized prior service credit	(6)
Accumulated other comprehensive loss	$ 103

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

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X

- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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