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Pensions and Other Postretirement Benefits - Fair Value of Plan Assets (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,675	$ 2,462
Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,543	1,379
Fair Value Inputs Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,132	1,083
Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,483	1,329
Common Stock | Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,483	1,329
Common Stock | Fair Value Inputs 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	399	377
International equity securities | Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International equity securities | Fair Value Inputs Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	399	377
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	297	303
Debt securities | Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt securities | Fair Value Inputs Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	297	303
U.S. government and agencies securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	146	172
U.S. government and agencies securities | Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. government and agencies securities | Fair Value Inputs Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	146	172
Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	117	84
Corporate Bonds | Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Corporate Bonds | Fair Value Inputs Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	117	84
Mortgage and Other Asset-backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24	26
Mortgage and Other Asset-backed Securities | Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Mortgage and Other Asset-backed Securities | Fair Value Inputs Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24	26
Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	149	121
Commingled Funds | Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Commingled Funds | Fair Value Inputs Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	149	121
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	60	50
Cash and cash equivalents | Fair Value Inputs Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	60	50
Cash and cash equivalents | Fair Value Inputs Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

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No definition available.

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+ References

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