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Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Aug. 09, 2013
Portion at Other than Fair Value Measurement [Member]      
Long-term Purchase Commitment [Line Items]      
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount $ 26 $ 28  
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount 35 $ 37 $ 40
Minimum payments on membership interests subject to mandatory redemption, due in next twelve months 3    
Other Commitment 232    
Minimum payments on membership interests subject to mandatory redemption, due in year two 3    
Minimum payments on membership interests subject to mandatory redemption, due in year three 2    
Minimum payments on membership interests subject to mandatory redemption, due in year four 1    
Minimum payments on membership interests subject to mandatory redemption, due in year five $ 1