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Fair Value Disclosures - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Assets    
Derivative assets $ 148 $ 167
Liabilities    
Derivative liabilities 131 99
Level 1 | Fair Value, Measurements, Recurring    
Assets    
Derivative assets 0 0
Investments and securities* 21 18
Total 21 18
Liabilities    
Derivative liabilities 0 0
Level 2 | Fair Value, Measurements, Recurring    
Assets    
Derivative assets 148 167
Investments and securities* 0 0
Total 148 167
Liabilities    
Derivative liabilities 131 99
Level 3 | Fair Value, Measurements, Recurring    
Assets    
Derivative assets 0 0
Investments and securities* 33 28
Total 33 28
Liabilities    
Derivative liabilities $ 0 $ 0