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COMMON STOCK AND SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2020
Common Stock And Share-Based Compensation [Abstract]  
Schedule of Compensation Expense for Share-based Incentive Awards
The following table provides a summary of total share-based compensation expense recognized by PG&E Corporation for share-based incentive awards for 2020:
(in millions)
202020192018
Stock Options$3 $7 $10 
Restricted stock units15 21 43 
Performance shares17 22 36 
Total compensation expense (pre-tax)$35 $50 $89 
Total compensation expense (after-tax)$25 $35 $63 
Summary of Significant Assumptions Used for Shares Granted The significant assumptions used for shares granted in 2019 were:
2019
Expected stock price volatility57.00 %
Expected annual dividend payment— %
Risk-free interest rate
1.51% to 1.52%
Expected life (years)4.5
Summary of Stock Option Activity
The following table summarizes stock option activity for PG&E Corporation and the Utility for 2020:
Number of
Stock Options		Weighted Average Grant-
Date Fair Value		Weighted Average Remaining Contractual TermAggregate Intrinsic Value
Outstanding at January 14,281,403 $5.98 $— 
Granted (1)
20,065 3.87 — 
Exercised— — — 
Forfeited or expired(2,080,221)3.87 — 
Outstanding at December 312,221,247 7.45 5.33 years— 
Vested or expected to vest at December 312,215,076 7.43 5.31 years— 
Exercisable at December 311,840,893 $6.86 4.93 years$— 
(1) Represents additional payout of existing stock option grants.
Schedule of Restricted Stock Units
The following table summarizes restricted stock unit activity for 2020:
Number of
Restricted Stock Units		Weighted Average Grant-
Date Fair Value
Nonvested at January 11,040,835 $44.06 
Granted1,007,782 9.25 
Vested(944,090)33.14 
Forfeited(214,174)15.75 
Nonvested at December 31890,353 $23.05 
Schedule of Performance Shares
The following table summarizes activity for performance shares in 2020:
Number of
Performance Shares		Weighted Average Grant-
Date Fair Value
Nonvested at January 1688,423 $36.92 
Granted7,951,541 9.62 
Vested(132,526)41.27 
Forfeited (1)
(1,218,656)24.38 
Nonvested at December 317,288,782 $9.16 
(1) Includes performance shares that expired with zero value as performance targets were not met.