v3.6.0.2

SCHEDULE I, CONDENSED FINANCIAL INFORMATION OF PARENT, STATEMENT OF OPERATIONS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (553) | $ (561) | $ (554)
Other (expense) income, net |  |  |  |  |  |  |  |  | 132 | 126 | 137
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (389) | (341) | (300)
Equity in earnings of subsidiaries, net of income taxes |  |  |  |  |  |  |  |  | 78 | 85 | 38
Net income/Earnings | $ 379 | $ 622 | $ 16 | $ 353 | $ 369 | $ 248 | $ 295 | $ 437 | $ 1,370 | $ 1,349 | $ 1,161
Basic earnings per common share (in dollars per share) | $ 1.51 | $ 2.48 | $ 0.06 | $ 1.41 | $ 1.48 | $ 1.00 | $ 1.19 | $ 1.76 | $ 5.48 | $ 5.43 | $ 4.72
Weighted-average number of shares outstanding for basic EPS | 250,600 | 250,400 | 250,100 | 249,700 | 248,700 | 248,400 | 248,100 | 247,700 | 250,217 | 248,249 | 245,891
Earnings Per Share, Diluted | $ 1.51 | $ 2.46 | $ 0.06 | $ 1.40 | $ 1.47 | $ 0.99 | $ 1.17 | $ 1.74 | $ 5.46 | $ 5.37 | $ 4.63
Weighted-average common shares outstanding for diluted EPS | 251,600 | 252,400 | 252,000 | 251,500 | 251,500 | 251,000 | 251,500 | 251,200 | 251,155 | 250,923 | 250,655
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (277) | $ (261) | $ (235)
Operation and maintenance |  |  |  |  |  |  |  |  | (81) | (66) | (78)
Other (expense) income, net |  |  |  |  |  |  |  |  | (2) | 7 | 50
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 181 | 150 | 133
Loss before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (179) | (170) | (130)
Equity in earnings of subsidiaries, net of income taxes |  |  |  |  |  |  |  |  | 1,549 | 1,519 | 1,291
Net income/Earnings |  |  |  |  |  |  |  |  | $ 1,370 | $ 1,349 | $ 1,161
Basic earnings per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 5.48 | $ 5.43 | $ 4.72
Weighted-average number of shares outstanding for basic EPS |  |  |  |  |  |  |  |  | 250,217 | 248,249 | 245,891
Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | $ 5.46 | $ 5.37 | $ 4.63
Weighted-average common shares outstanding for diluted EPS |  |  |  |  |  |  |  |  | 251,155 | 250,923 | 250,655

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