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Pension Plans and Other Post Employment Benefit Plans Summary of Fair Value Measurement of Level 3 Pension Plan Assets (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 17,835 $ 16,941 $ 18,951
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 115 52 330
Actual Return (Loss) on Plan Assets Sold (38) (21)  
Actual Return (Loss) on Plan Assets Still Held 34 16  
Purchases, Sales, and Settlements 5 (14)  
Assets Transferred into (out of) Level 3 62 0  
Plan assets transferred due to sale, liquidation, spin-off, or divestiture   (259)  
Corporate Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,579 2,956  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 4 14
Actual Return (Loss) on Plan Assets Sold (7) 9  
Actual Return (Loss) on Plan Assets Still Held 5 (8)  
Purchases, Sales, and Settlements 0 (12)  
Assets Transferred into (out of) Level 3 1 1  
Plan assets transferred due to sale, liquidation, spin-off, or divestiture   0  
Asset-backed Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 616 663  
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Private Market Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 2  
Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 2 1
Actual Return (Loss) on Plan Assets Sold 0 0  
Actual Return (Loss) on Plan Assets Still Held 1 4  
Purchases, Sales, and Settlements 0 (3)  
Assets Transferred into (out of) Level 3 0 0  
Plan assets transferred due to sale, liquidation, spin-off, or divestiture   0  
Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 28 33  
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 28 33 93
Actual Return (Loss) on Plan Assets Sold 0 (29)  
Actual Return (Loss) on Plan Assets Still Held (5) 25  
Purchases, Sales, and Settlements 0 (3)  
Assets Transferred into (out of) Level 3 0 0  
Plan assets transferred due to sale, liquidation, spin-off, or divestiture   (53)  
Derivative, Asset [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76 19  
Derivative, Asset [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 73 0 206
Actual Return (Loss) on Plan Assets Sold 0 0  
Actual Return (Loss) on Plan Assets Still Held 7 0  
Purchases, Sales, and Settlements 5 0  
Assets Transferred into (out of) Level 3 61 0  
Plan assets transferred due to sale, liquidation, spin-off, or divestiture   (206)  
Non-US [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,194 2,053  
Non-US [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 4 2
Actual Return (Loss) on Plan Assets Sold (6) 1  
Actual Return (Loss) on Plan Assets Still Held 5 0  
Purchases, Sales, and Settlements 0 2  
Assets Transferred into (out of) Level 3 0 (1)  
Plan assets transferred due to sale, liquidation, spin-off, or divestiture   0  
UNITED STATES | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,905 [1] 3,665 [2]  
UNITED STATES | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 [1] 9 [2] $ 14
Actual Return (Loss) on Plan Assets Sold (25) (2)  
Actual Return (Loss) on Plan Assets Still Held 21 (5)  
Purchases, Sales, and Settlements 0 2  
Assets Transferred into (out of) Level 3 $ 0 0  
Plan assets transferred due to sale, liquidation, spin-off, or divestiture   $ 0  
[1] The Corteva pension plans directly held $165 million (approximately 1 percent of total plan assets) of Corteva, Inc. common stock at December 31, 2020.
[2] The Corteva pension plans directly held $126 million (approximately 1 percent of total plan assets) of Corteva, Inc. at December 31, 2019.