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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - CASH FLOWS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash used in operating activities | $ 3,447 | $ 3,625 | $ 2,311
Expenditures for property, plant and equipment | (3,784) | (3,949) | (4,214)
Expenditures for acquisition | 9,776 | 147 | 1,342
Net cash used in investing activities | (12,557) | (4,700) | (4,835)
Common stock dividends paid | (877) | (755) | (686)
Preferred dividends paid | (89) | 0 | 0
Issuances of mandatory convertible preferred stock, net of $42 in offering costs in 2018 | 2,258 | 0 | 0
Issuances of common stock, net of $41 in offering costs in 2018 | 2,272 | 47 | 51
Repurchases of common stock | (21) | (15) | (56)
Issuances of long-term debt | 9,174 | 4,509 | 2,951
Payments on long-term debt | (3,510) | (2,800) | (2,057)
Net cash provided by financing activities | 9,006 | 1,007 | 2,502
Cash and cash equivalents, January 1 | 288 |  |
Cash and cash equivalents, December 31 | 190 | 288 |
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES |  |  |
Accrued Merger-related transaction costs | 0 | 31 | 0
Common dividends issued in stock | 54 | 53 | 53
Parent Company [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash used in operating activities | 213 | 89 | (3)
Expenditures for property, plant and equipment | (11) | (11) | (5)
Expenditures for acquisition | (329) | 0 | 0
Capital contributions to investees | (9,457) | 0 | 0
Decrease (increase) in loans to affiliate, net | (1) | 0 | 457
Expenditures for Merger-related costs | 0 | (12) | 0
Net cash used in investing activities | (9,798) | (23) | 452
Common stock dividends paid | (877) | (755) | (686)
Preferred dividends paid | (89) | 0 | 0
Issuances of mandatory convertible preferred stock, net of $42 in offering costs in 2018 | 2,258 | 0 | 0
Issuances of common stock, net of $41 in offering costs in 2018 | 2,272 | 47 | 51
Repurchases of common stock | (21) | (15) | (56)
Issuances of long-term debt | 4,969 | 1,595 | 499
Payments on long-term debt | (500) | (600) | (750)
Increase (decrease) in loans from affiliates, net | 1,520 | (239) | 504
Payments of Debt Issuance Costs | (37) | (7) | (3)
Net cash provided by financing activities | 9,495 | 26 | (441)
Increase (decrease) in cash and cash equivalents | (90) | 92 | 8
Cash and cash equivalents, January 1 | 104 | 12 | 4
Cash and cash equivalents, December 31 | 14 | 104 | 12
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES |  |  |
Accrued Merger-related transaction costs | 0 | 31 | 0
Preferred dividends declared but not paid | 36 | 0 | 0
Common dividends issued in stock | 54 | 53 | 53
Common dividends declared but not paid | 245 | $ 207 | $ 189
Non-controlling interests [Member] | Parent Company [Member] |  |  |
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES |  |  |
Offering costs from issuance of mandatory convertible preferred stock | 42 |  |
Common Stock [Member] | Parent Company [Member] |  |  |
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES |  |  |
Offering costs from issuance of common stock | $ 41 |  |

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