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Pensions and Other Postretirement Benefits - Fair Value of Plan Assets (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,861	$ 2,675
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,425	1,543
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,436	1,132
Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,383	1,483
Common stock | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,383	1,483
Common stock | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	397	399
International equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	397	399
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	367	297
Debt securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	367	297
Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	189
Domestic equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Domestic equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	189
Government and agencies securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	170	146
Government and agencies securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Government and agencies securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	170	146
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120	117
Corporate bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120	117
Mortgage and other asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33	24
Mortgage and other asset-backed securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Mortgage and other asset-backed securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33	24
Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	160	149
Commingled funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Commingled funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	160	149
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	60
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	60
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

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- Definition

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+ References

No definition available.

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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