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Pensions and Other Postretirement Benefits - Fair Value of Plan Assets (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 2,462 $ 2,105
Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,379 1,178
Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,083 927
Common Stock    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,329 1,106
Common Stock | Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,329 1,106
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 377 314
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 377 314
Debt securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 303 287
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 303 287
U.S. government and agencies securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 172 89
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 172 89
Corporate Bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 84 83
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 84 83
Mortgage and Other Asset-backed Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 26 62
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 26 62
Commingled Funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 121 92
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 121 92
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 50 72
Cash and cash equivalents | Fair Value Inputs Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 50 72
Cash and cash equivalents | Fair Value Inputs Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0 $ 0