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Schedule I - Condensed Financial Information of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 2,489 | $ 2,884 | $ 2,134
Investing Activities: |  |  |
Decrease in restricted cash | (135) | (61) | (159)
Purchase of short term investments, net | (625) | (55) | (17)
Net cash used in investing activities | (2,749) | (2,108) | (2,366)
Financing Activities: |  |  |
Borrowings under the revolver, net | 2,156 | 1,465 | 959
Purchase of treasury stock | 0 | (79) | (482)
Common stock dividends paid | (317) | (290) | (276)
Payments for deferred financing costs | (100) | (105) | (90)
Payments to Noncontrolling Interests | (424) | (476) | (326)
Proceeds from (Payments for) Other Financing Activities | (52) | (44) | (7)
Net cash provided by (used in) financing activities | 43 | (747) | 28
Effect of exchange rate changes on cash | 3 | 9 | (52)
Total increase (decrease) in cash and cash equivalents | (295) | 26 | (231)
Cash and cash equivalents, beginning | 1,244 | 1,218 |
Cash and cash equivalents, ending | 949 | 1,244 | 1,218
SUPPLEMENTAL DISCLOSURES: |  |  |
Cash payments for interest, net of amounts capitalized | (1,196) | (1,273) | (1,265)
Cash payments for income taxes, net of refunds | (377) | (487) | (388)
Parent Company [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 148 | 818 | 475
Investing Activities: |  |  |
Investment in and net advances to subsidiaries | (339) | (650) | (221)
Return of capital | 243 | 247 | 501
Decrease in restricted cash | 3 | 29 | 49
Additions to property, plant and equipment | (13) | (12) | (11)
Net cash used in investing activities | (106) | (386) | 318
Financing Activities: |  |  |
Borrowings under the revolver, net | 207 | 0 | 0
Borrowings of notes payable and other coupon bearing securities | 1,025 | 500 | 575
Repayments of notes payable and other coupon bearing securities | (1,353) | (808) | (915)
Loans from subsidiaries | 309 | 183 | 0
Purchase of treasury stock | 0 | (79) | (482)
Proceeds from issuance of common stock | 1 | 1 | 4
Common stock dividends paid | (317) | (290) | (276)
Payments for deferred financing costs | (12) | (12) | (6)
Payments to Noncontrolling Interests | 0 | (2) | 0
Proceeds from (Payments for) Other Financing Activities | (7) | (3) | (18)
Net cash provided by (used in) financing activities | (147) | (510) | (1,118)
Effect of exchange rate changes on cash | 6 | 1 | 0
Total increase (decrease) in cash and cash equivalents | (99) | (77) | (325)
Cash and cash equivalents, beginning | 109 | 186 | 511
Cash and cash equivalents, ending | 10 | 109 | 186
SUPPLEMENTAL DISCLOSURES: |  |  |
Cash payments for interest, net of amounts capitalized | 282 | 296 | 314
Cash payments for income taxes, net of refunds | $ 2 | $ 6 | $ 0

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