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Schedule I - Condensed Financial Information - Income and Comprehensive Income (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements,Captions [Line Items] |  |  |
Interest expense | $ (991) | $ (819) | $ (729)
NET INCOME FOR COMMON STOCK | 1,343 | 1,382 | 1,525
Comprehensive Income | $ 1,340 | $ 1,392 | $ 1,526
Net Income Per Share – Basic (in dollars per share) | $ 4.09 | $ 4.43 | $ 4.97
Net Income Per Share – Diluted (in dollars per share) | $ 4.08 | $ 4.42 | $ 4.94
Average Number Of Shares Outstanding—Basic (in shares) | 328.5 | 311.7 | 307.1
Average Number Of Shares Outstanding—Diluted (in shares) | 329.5 | 312.9 | 308.8
Parent Company |  |  |
Condensed Income Statements,Captions [Line Items] |  |  |
Equity in earnings of subsidiaries | $ 1,354 | $ 1,447 | $ 1,544
Other income (deductions), net of taxes | 76 | (6) | 31
Interest expense | (87) | (59) | (50)
NET INCOME FOR COMMON STOCK | 1,343 | 1,382 | 1,525
Comprehensive Income | $ 1,340 | $ 1,392 | $ 1,526
Net Income Per Share – Basic (in dollars per share) | $ 4.09 | $ 4.43 | $ 4.97
Net Income Per Share – Diluted (in dollars per share) | 4.08 | 4.42 | 4.94
Dividends Declared Per Share (in dollars per share) | $ 2.96 | $ 2.86 | $ 2.76
Average Number Of Shares Outstanding—Basic (in shares) | 328.5 | 311.1 | 307.1
Average Number Of Shares Outstanding—Diluted (in shares) | 329.5 | 312.9 | 308.8

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