Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Summary of Post-Closing Guarantees) (Details)

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Commitments and Contingencies (Summary of Post-Closing Guarantees) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
May 31, 2018
Guarantor Obligations [Line Items]      
Total $ 61 $ 61  
Guarantees      
Guarantor Obligations [Line Items]      
Post-closing credit support at time of sale     $ 81
Additional post-closing credit support     46
Total     127
Fair Value of Guarantees      
Guarantor Obligations [Line Items]      
Post-closing credit support at time of sale     39
Additional post-closing credit support     22
Total     61
Receivable from former Parent      
Guarantor Obligations [Line Items]      
Post-closing credit support at time of sale     26
Additional post-closing credit support     15
Total     $ 41