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Derivative Financial Instruments - Summary of Potential Effect of Offsetting Derivatives (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative assets    
Gross Amounts of Recognized Assets/Liabilities $ 12 $ 37
Gross Amounts Offset on the Consolidated Balance Sheets 0 0
Amounts of Assets/Liabilities Presented on the Consolidated Balance Sheets 12 37
Derivative Financial Instruments (12) (6)
Cash Collateral Received/Pledged 0 0
Net Amount (Legal Offset) 0 31
Derivative liabilities    
Gross Amounts of Recognized Assets/Liabilities (121) (8)
Gross Amounts Offset on the Consolidated Balance Sheets 0 0
Amounts of Assets/Liabilities Presented on the Consolidated Balance Sheets (121) (8)
Derivative Financial Instruments 12 7
Cash Collateral Received/ Pledged 0 0
Net Amount (Legal Offset) $ (109) $ (1)