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Consolidated Statement of Changes in Shareholders Equity - USD ($) shares in Thousands, $ in Millions | Total | Pepco Holdings LLC [Member] | Commitments [Member] Pepco Holdings LLC [Member] | Common Stock [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest [Member] | Preference Stock Not Subject To Mandatory Redemption [Member] | Exelon Generation Co L L C [Member] | Exelon Generation Co L L C [Member] Membership Interest [Member] | Exelon Generation Co L L C [Member] Undistributed Earnings [Member] | Exelon Generation Co L L C [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Exelon Generation Co L L C [Member] Noncontrolling Interest [Member] | Commonwealth Edison Co [Member] | Commonwealth Edison Co [Member] Common Stock [Member] | Commonwealth Edison Co [Member] Other Additional Capital [Member] | Commonwealth Edison Co [Member] Retained Earnings, Unappropriated [Member] | Commonwealth Edison Co [Member] Retained Earnings Appropriated [Member] | PECO Energy Co [Member] | PECO Energy Co [Member] Common Stock [Member] | PECO Energy Co [Member] Retained Earnings [Member] | PECO Energy Co [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Baltimore Gas and Electric Company [Member] | Baltimore Gas and Electric Company [Member] Parent [Member] | Baltimore Gas and Electric Company [Member] Common Stock [Member] | Baltimore Gas and Electric Company [Member] Common Stock [Member] Parent [Member] | Baltimore Gas and Electric Company [Member] Retained Earnings [Member] | Baltimore Gas and Electric Company [Member] Membership Interest [Member] | Baltimore Gas and Electric Company [Member] Membership Interest [Member] Parent [Member] | Baltimore Gas and Electric Company [Member] Preference Stock Not Subject To Mandatory Redemption [Member] | Pepco Holdings LLC [Member] | Pepco Holdings LLC [Member] Pepco Holdings LLC [Member] | [4] | Pepco Holdings LLC [Member] Deferred Compensation, Share-based Payments [Member] Pepco Holdings LLC [Member] | Pepco Holdings LLC [Member] Common Stock [Member] | [1] | Pepco Holdings LLC [Member] Retained Earnings [Member] | Pepco Holdings LLC [Member] Membership Interest [Member] | Pepco Holdings LLC [Member] Membership Interest [Member] Pepco Holdings LLC [Member] | [4] | Pepco Holdings LLC [Member] Undistributed Earnings [Member] | Pepco Holdings LLC [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Pepco Holdings LLC [Member] Additional Paid-in Capital [Member] | Potomac Electric Power Company [Member] | Potomac Electric Power Company [Member] Common Stock [Member] | Potomac Electric Power Company [Member] Retained Earnings [Member] | Delmarva Power & Light Company [Member] | Delmarva Power & Light Company [Member] Common Stock [Member] | Delmarva Power & Light Company [Member] Retained Earnings [Member] | Atlantic City Electric Company [Member] | Atlantic City Electric Company [Member] Common Stock [Member] | Atlantic City Electric Company [Member] Retained Earnings [Member]
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Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 27,330 |  |  | $ 18,676 | $ (2,327) | $ 12,104 | $ (2,624) |  | $ 1,308 | $ 193 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Additional Capital | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,829 |  |  |  |  |  |  |  |  |
Beginning Balance (in shares) at Dec. 31, 2015 |  | 954,668 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,243 | $ 1,588 | $ 5,677 | $ (1,639) | $ 2,617 | $ 3,236 | $ 2,455 | $ 780 | $ 1 |  | $ 2,877 |  | $ 1,367 |  | $ 1,320 | $ 2,687 |  | $ 190 |  |  |  |  |  |  |  |  |  |  | $ 2,240 | $ 1,122 | $ 1,118 | $ 1,237 | $ 612 | $ 625 | $ 1,000 | $ 773 | $ 227
Beginning Balance (Predecessor [Member]) at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,413 |  |  | $ 3,832 | $ 617 |  |  |  | $ (36) |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  | $ 12,978 | $ 8,997 | $ 2,737 | $ (63) |  | $ 1,307 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan issuances | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit on stock compensation | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of income taxes | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Ending Balance (Predecessor [Member]) at Mar. 23, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,439 |  |  | 3,838 | 636 |  |  |  | (35) |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Other | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (in shares) at Dec. 31, 2015 |  | 954,668 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,243 | 1,588 | 5,677 | (1,639) | 2,617 | 3,236 | 2,455 | 780 | 1 |  | 2,877 |  | 1,367 |  | 1,320 | 2,687 |  | 190 |  |  |  |  |  |  |  |  |  |  | 2,240 | 1,122 | 1,118 | 1,237 | 612 | 625 | 1,000 | 773 | 227
Beginning Balance (Predecessor [Member]) at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,413 |  |  | 3,832 | 617 |  |  |  | (36) |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  | 12,978 | 8,997 | 2,737 | (63) |  | 1,307 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ 1,196 | $ (66) |  |  |  | 1,121 |  |  | 67 | 8 | 550 |  | 483 |  |  | 67 | 378 |  |  | 378 |  | 438 |  | 438 |  |  | 294 |  |  |  | 294 | 294 |  |  |  |  |  |  |  |  |  |  |  |  | 42 |  | 42 | (9) |  | (9) | (42) | 0 | (42)
Stock Issued During Period, Shares, Share-based Compensation, Gross |  | 2,868 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Share-based Compensation, Gross |  | $ 85 |  |  | 85 | 0 | 0 | 0 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan issuances, shares |  | 1,242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan issuances |  | $ 55 |  |  | 55 | 0 | 0 | 0 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit on stock compensation |  | (18) |  |  | (18) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  | 5 |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of noncontrolling interests |  | 239 |  |  | (4) |  |  |  |  | 243 |  | 239 | (4) |  |  |  | 243 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Change in Redemption Value |  | 157 |  |  |  |  |  |  |  | 157 |  | 157 |  |  |  |  | 157 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  | (1,172) |  |  |  |  | (1,172) |  |  |  |  |  |  |  |  |  |  | (369) |  |  |  | (369) | (277) |  | (277) |  |  | (179) |  |  |  | (179) | (179) |  |  |  |  |  |  |  |  |  |  |  |  | (169) |  | (169) | (54) |  | (54) | (63) | 0 | (63)
Preferred and preference stock dividends |  | (8) |  |  |  |  |  |  |  |  | (8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8) |  |  |  | (8) | (8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  | (193) |  |  |  |  |  |  |  |  | (193) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (190) |  |  |  |  |  |  | (190) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  |  |  |  |  |  |  |  |  |  |  | 268 | 268 |  |  |  |  | 315 |  | 315 |  |  |  |  |  |  |  | 61 | $ (7) | 61 | $ (7) |  | 61 | $ (7) |  |  |  |  |  |  |  |  |  |  |  | 187 | 187 |  | 152 | 152 |  | 139 | 139 |
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared |  |  |  |  |  |  |  |  |  |  |  | (922) |  | (922) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Effects Allocated Directly to Equity, Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 | 18 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of income taxes |  | $ (36) |  |  |  |  | 0 | (36) |  |  |  | 9 |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2016 |  | 958,778 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,725 | 1,588 | 6,150 | (1,639) | 2,626 | 3,415 | 2,473 | 941 | 1 |  | 2,848 |  | 1,421 |  | 1,427 | 2,848 |  | 0 |  |  |  |  |  |  |  |  |  |  | 2,300 | 1,309 | 991 | 1,326 | 764 | 562 | 1,034 | 912 | 122
Ending Balance (Successor [Member]) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,016 |  |  |  |  | $ 8,077 |  | $ (61) | 0 |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  | 13,284 | 9,261 | 2,298 | (54) |  | 1,779 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Additional Capital | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,835 |  |  |  |  |  |  |  |  |
Common stock | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3 |  |  |  |  |  |  |  |  |
Beginning Balance (Predecessor [Member]) at Mar. 23, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,439 |  |  | $ 3,838 | $ 636 |  |  |  | (35) |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (61) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of income taxes | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2016 |  | 958,778 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,725 | 1,588 | 6,150 | (1,639) | 2,626 | 3,415 | 2,473 | 941 | 1 |  | 2,848 |  | 1,421 |  | 1,427 | 2,848 |  | 0 |  |  |  |  |  |  |  |  |  |  | 2,300 | 1,309 | 991 | 1,326 | 764 | 562 | 1,034 | 912 | 122
Ending Balance (Successor [Member]) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,016 |  |  |  |  | 8,077 |  | (61) | 0 |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  | 13,284 | 9,261 | 2,298 | (54) |  | 1,779 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Other | Successor [Member] |  |  |  | $ 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 165 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Asset | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Asset |  | $ 235 |  |  |  |  |  |  |  |  |  | 163 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (Successor [Member]) at Mar. 24, 2016 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,200 |  |  |  |  | 7,200 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (61) |  |  |  |  |  |  | (61) |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53 |  |  |  |  | 53 |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared | Successor [Member] | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (400) |  |  |  |  | (400) |  |  |  |  |  |  |  |  |  |  |  |  |
Members Equity Including Portion Attributable To Noncontrolling Interest Acquisitions | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,251 |  |  |  |  | 1,251 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2016 |  | 958,778 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,725 | 1,588 | 6,150 | (1,639) | 2,626 | 3,415 | 2,473 | 941 | 1 |  | 2,848 |  | 1,421 |  | 1,427 | 2,848 |  | 0 |  |  |  |  |  |  |  |  |  |  | 2,300 | 1,309 | 991 | 1,326 | 764 | 562 | 1,034 | 912 | 122
Ending Balance (Successor [Member]) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,016 |  |  |  |  | 8,077 |  | (61) | 0 |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  | 13,284 | 9,261 | 2,298 | (54) |  | 1,779 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Other | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 | $ (62) |  |  |  | 35 | $ (62) |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 27,640 |  |  | 18,794 | (2,327) | 12,053 | (2,660) | [5] | 1,780 | 0 |  |  |  | (54) | [5] |  |  |  |  |  |  |  |  |  | 1 | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Additional Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 158 |  | 158 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained Earnings, Appropriated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (378) | 378 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ 3,876 | 364 |  |  |  | 3,786 |  |  | 90 | 0 | 2,798 |  | 2,710 |  |  | 88 | 567 |  |  | 567 |  | 434 |  | 434 |  |  | 307 |  |  |  | 307 | 307 |  |  | 362 |  |  |  |  |  |  | 362 |  |  | 205 |  | 205 | 121 |  | 121 | 77 | 0 | 77
Stock Issued During Period, Shares, Share-based Compensation, Gross |  | 5,066 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Share-based Compensation, Gross |  | $ 56 |  |  | 56 | 0 | 0 |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan issuances, shares |  | 1,324 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan issuances |  | $ 150 |  |  | 150 | 0 | 0 |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Treasury Stock Reissued |  | (1,150) |  |  |  | 2,204 | (1,054) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit on stock compensation |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of noncontrolling interests |  | 407 |  |  | (36) |  |  |  |  | 443 |  | 407 | (36) |  |  |  | 443 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Change in Redemption Value |  | (20) |  |  |  |  |  |  |  | (20) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  | (18) |  |  |  |  | (18) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid |  |  |  |  |  |  |  |  |  |  |  | 33 | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  | (1,243) |  |  |  |  | (1,243) |  |  |  |  |  |  |  |  |  |  | (422) |  |  |  | (422) | (288) |  | (288) |  |  | (198) |  |  |  | (198) | (198) |  |  |  |  |  |  |  |  |  |  |  |  | (133) |  | (133) | (112) |  | (112) | (68) | 0 | (68)
Adjustments to Additional Paid in Capital, Other |  | 0 |  |  |  |  |  |  |  |  |  | 99 | 99 |  |  |  |  | 651 |  | 651 |  |  |  |  |  |  |  | 184 |  | 184 |  |  | 184 |  | 0 |  |  |  |  |  |  |  |  |  |  | 161 | 161 |  |  |  |  |  |  |
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared |  |  |  |  |  |  |  |  |  |  |  | (659) |  | (659) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (311) |  |  |  |  |  |  | (311) |  |  |  |  |  |  |  |  |  |  |
Income Tax Effects Allocated Directly to Equity, Other |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of income taxes |  | $ 171 |  |  |  |  | 0 | 173 | [5] | (2) |  | 15 |  |  | 17 | [5] | (2) |  |  |  |  |  |  |  |  | 0 | [5] |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Members Equity Including Portion Attributable To Noncontrolling Interest Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 758 |  |  |  |  | 758 |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of adoption of Recognition and Measurement of Financial Assets and Liabilities standard |  |  |  |  |  |  | 539 | (539) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2017 |  | 965,168 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2017 |  | $ 29,896 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,542 | 1,588 | 6,822 | (1,639) | 2,771 | 3,577 | 2,489 | 1,087 | 1 |  | 3,141 |  | 1,605 |  | 1,536 | 3,141 |  | 0 |  |  |  |  |  |  |  |  |  |  | 2,533 | 1,470 | 1,063 | 1,335 | 764 | 571 | 1,043 | 912 | 131
Ending Balance at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  | 15,959 | 9,357 | 4,349 | (37) |  | 2,290 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,825 |  |  |  |  | 8,835 |  | (10) | 0 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 32,187 |  |  | 18,964 | (123) | 14,081 | (3,026) | [5] | 2,291 | 0 |  |  |  | (37) | [5] |  |  |  |  |  |  |  |  |  | 1 | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Additional Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained Earnings, Appropriated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,771 |  |  | (567) | 567 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,822 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | 18,964 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,588 |  |  |  |  | 2,489 |  |  |  |  | 1,605 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,470 |  |  | 764 |  |  | 912 |  |
Net income (loss) |  | $ 2,084 | $ 453 |  |  |  | 2,010 |  |  | 74 | 0 | 443 |  | 370 |  |  | 73 | 664 |  |  | 664 |  | 460 |  | 460 |  |  | 313 |  |  |  | 313 | 313 |  |  | 398 |  |  |  |  |  |  | 398 |  |  | 210 |  | 210 | 120 |  | 120 | 75 | 0 | 75
Stock Issued During Period, Shares, Share-based Compensation, Gross |  | 3,534 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Share-based Compensation, Gross |  | $ 41 |  |  | 41 | 0 | 0 | 0 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan issuances, shares |  | 1,318 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan issuances |  | $ 105 |  |  | 105 | 0 | 0 | 0 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of noncontrolling interests |  | 6 |  |  | 6 |  |  | 0 |  | 0 | 0 | 6 | 6 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Period Increase (Decrease) |  | (60) |  |  | 0 |  |  |  |  | (60) |  | (60) |  |  |  |  | (60) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  | (1,339) |  |  |  |  | (1,339) |  |  |  |  |  |  |  |  |  |  | (459) |  |  |  | (459) | (306) |  | (306) |  |  | (209) |  |  |  | (209) | (209) |  |  |  |  |  |  |  |  |  |  |  |  | (169) |  | (169) | (96) |  | (96) | (59) | 0 | (59)
Adjustments to Additional Paid in Capital, Other |  |  |  |  |  |  |  |  |  |  |  | 155 | 155 |  |  |  |  | 500 |  | 500 |  |  |  |  |  |  |  | 109 |  | 109 |  | 0 | 109 |  | 0 |  |  |  |  |  |  |  |  |  |  | 166 | 166 |  | 150 | 150 |  | 67 | 67 |
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared |  |  |  |  |  |  |  |  |  |  |  | (1,001) |  | (1,001) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (326) |  |  |  |  |  |  | (326) |  |  |  |  |  |  |  |  |  |  |
Income Tax Effects Allocated Directly to Equity, Other |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 89 | 89 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of income taxes |  | 42 |  |  |  |  | 0 | 41 | [5] | 1 |  | 3 |  |  | 2 | [5] | 1 |  |  |  |  |  |  |  |  | 0 | [5] |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Members Equity Including Portion Attributable To Noncontrolling Interest Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 385 |  |  |  |  | 385 |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of adoption of Recognition and Measurement of Financial Assets and Liabilities standard |  | $ 4 |  |  |  |  | 14 | (10) |  |  |  | 3 |  | 6 | (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2018 |  | 970,020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2018 |  | $ 30,764 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,247 | $ 1,588 | $ 7,322 | (1,639) | 2,976 | 3,820 | $ 2,578 | $ 1,242 | 0 |  | 3,354 |  | $ 1,714 |  | $ 1,640 | $ 3,354 |  | $ 0 |  |  |  |  |  |  |  |  |  |  | 2,740 | $ 1,636 | $ 1,104 | 1,509 | $ 914 | $ 595 | 1,126 | $ 979 | $ 147
Ending Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  | $ 15,508 | $ 9,518 | $ 3,724 | (38) |  | $ 2,304 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,282 |  |  |  |  | $ 9,220 |  | $ 62 | $ 0 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 33,070 |  |  | $ 19,116 | $ (123) | $ 14,766 | $ (2,995) | [5] | $ 2,306 | $ 0 |  |  |  | $ (38) | [5] |  |  |  |  |  |  |  |  |  | $ 0 | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained Earnings, Appropriated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,976 |  |  | $ (664) | $ 664 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,322 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | $ 19,116 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,588 |  |  |  |  | $ 2,578 |  |  |  |  | $ 1,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,636 |  |  | $ 914 |  |  | $ 979 |  |
[1] | At March 23, 2016 and December 31, 2015, PHI's (predecessor) shareholders' equity included $3,835 million and $3,829 million of other paid-in capital, and $3 million and $3 million of common stock, respectively.
[2] | The March 24, 2016, beginning balance differs from the PHI Merger total purchase price by $59 million related to an acquisition accounting adjustment recorded at Exelon Corporate to reflect unitary state income tax consequences of the merger.
[3] | Distribution to member includes $235 million of net assets associated with PHI's unregulated business interests and $165 million of cash, each of which were distributed by PHI to Exelon.
[4] | he liabilities assumed include $29 million for PHI stock-based compensation awards and $33 million for a merger related obligation, each assumed by PHI from Exelon. See Note 5 — Mergers, Acquisitions and Dispositions.
[5] | All amounts are net of tax and noncontrolling interests. Amounts in parenthesis represent a decrease in AOCI.

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