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Fair Value Measurements - Recurring Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Liabilities    
Investment excludes receivables, payables and accrued income   $ 1
Recurring    
Assets    
Fair value, assets $ 1,633 2,123
Liabilities    
Fair value, liabilities (2) 0
Net assets (liabilities) 1,631 2,123
Recurring | FTRs | Derivative Liabilities    
Liabilities    
Fair value, liabilities (2) 0
Recurring | FTRs | Derivative Assets    
Assets    
Fair value, assets 5 3
Recurring | Equity securities    
Assets    
Fair value, assets 2 2
Recurring | U.S. state debt securities    
Assets    
Fair value, assets 269 276
Recurring | Cash, cash equivalents and restricted cash    
Assets    
Fair value, assets 1,312 1,801
Recurring | Other    
Assets    
Fair value, assets 45 41
Recurring | Level 1    
Assets    
Fair value, assets 1,314 1,803
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 1,314 1,803
Recurring | Level 1 | FTRs | Derivative Liabilities    
Liabilities    
Fair value, liabilities 0 0
Recurring | Level 1 | FTRs | Derivative Assets    
Assets    
Fair value, assets 0 0
Recurring | Level 1 | Equity securities    
Assets    
Fair value, assets 2 2
Recurring | Level 1 | U.S. state debt securities    
Assets    
Fair value, assets 0 0
Recurring | Level 1 | Cash, cash equivalents and restricted cash    
Assets    
Fair value, assets 1,312 1,801
Recurring | Level 1 | Other    
Assets    
Fair value, assets 0 0
Recurring | Level 2    
Assets    
Fair value, assets 314 317
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 314 317
Recurring | Level 2 | FTRs | Derivative Liabilities    
Liabilities    
Fair value, liabilities 0 0
Recurring | Level 2 | FTRs | Derivative Assets    
Assets    
Fair value, assets 0 0
Recurring | Level 2 | Equity securities    
Assets    
Fair value, assets 0 0
Recurring | Level 2 | U.S. state debt securities    
Assets    
Fair value, assets 269 276
Recurring | Level 2 | Cash, cash equivalents and restricted cash    
Assets    
Fair value, assets 0 0
Recurring | Level 2 | Other    
Assets    
Fair value, assets 45 41
Recurring | Level 3    
Assets    
Fair value, assets 5 3
Liabilities    
Fair value, liabilities (2) 0
Net assets (liabilities) 3 3
Recurring | Level 3 | FTRs | Derivative Liabilities    
Liabilities    
Fair value, liabilities (2) 0
Recurring | Level 3 | FTRs | Derivative Assets    
Assets    
Fair value, assets 5 3
Recurring | Level 3 | Equity securities    
Assets    
Fair value, assets 0 0
Recurring | Level 3 | U.S. state debt securities    
Assets    
Fair value, assets 0 0
Recurring | Level 3 | Cash, cash equivalents and restricted cash    
Assets    
Fair value, assets 0 0
Recurring | Level 3 | Other    
Assets    
Fair value, assets $ 0 $ 0