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Schedule I - Condensed Financial Information of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ (2,755) | $ (2,466) | $ (2,343)
Investing Activities: |  |  |
Sale of short-term investments | 627 | 666 | 1,302
Net cash used in investing activities | (2,295) | (2,721) | (505)
Financing Activities: |  |  |
Common stock dividends paid | (381) | (362) | (344)
Payments for deferred financing costs | (107) | (126) | (39)
Proceeds from (Payments for) Other Financing Activities | (52) | 9 | 49
Net cash used in financing activities | (78) | (86) | (1,643)
Effect of exchange rate changes on cash | (24) | (18) | (54)
Cash and cash equivalents, beginning | 1,029 |  |
Cash and cash equivalents, ending | 1,089 | 1,029 |
SUPPLEMENTAL DISCLOSURES: |  |  |
Cash payments for interest, net of amounts capitalized | (908) | (946) | (1,003)
Cash payments for income taxes, net of refunds | (333) | (363) | (370)
Parent Company [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | (434) | (583) | 409
Investing Activities: |  |  |
Proceeds from the sale of business interests, net of expenses | 412 | 196 | 1,222
Investment in and net advances to subsidiaries | (652) | (596) | (216)
Return of capital | 346 | 411 | 242
Additions to property, plant and equipment | (8) | (8) | (13)
Sale of short-term investments | (1) | 0 | 0
Net cash used in investing activities | 97 | 3 | 1,235
Financing Activities: |  |  |
(Repayments) Borrowings under the revolver, net | (110) | 180 | (207)
Borrowings of notes payable and other coupon bearing securities | 3,397 | 0 | 1,000
Repayments of notes payable and other coupon bearing securities | (3,366) | (450) | (1,933)
Loans from (Repayments to) subsidiaries | 25 | 40 | (143)
Proceeds from issuance of common stock | 4 | 6 | 7
Common stock dividends paid | (381) | (362) | (344)
Payments for deferred financing costs | (38) | (3) | (11)
Proceeds from (Payments for) Other Financing Activities | (3) | (4) | (5)
Net cash used in financing activities | (472) | (593) | (1,636)
Effect of exchange rate changes on cash | 0 | (1) | 1
Total increase (decrease) in cash, cash equivalents and restricted cash | 59 | (8) | 9
Cash and cash equivalents, beginning | 11 | 19 |
Cash and cash equivalents, ending | 70 | 11 | 19
SUPPLEMENTAL DISCLOSURES: |  |  |
Cash payments for interest, net of amounts capitalized | 156 | 192 | 232
Cash payments for income taxes, net of refunds | $ (8) | $ (5) | $ 10

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