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Schedule I - Condensed Financial Information of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 2,884 | $ 2,134 | $ 1,791
Investing Activities: |  |  |
Decrease in restricted cash | (61) | (159) | 419
Purchase of short term investments, net | (55) | (17) | (728)
Net cash used in investing activities | (2,108) | (2,366) | (656)
Financing Activities: |  |  |
Borrowings (payments) under the revolver, net | 1,465 | 959 | 836
Purchase of treasury stock | (79) | (482) | (308)
Common stock dividends paid | (290) | (276) | (144)
Payments for deferred financing costs | (105) | (90) | (158)
Payments to Noncontrolling Interests | (476) | (326) | (485)
Proceeds from (Payments for) Other Financing Activities | (44) | (7) | 27
Net cash (used in) provided by financing activities | (747) | 28 | (1,262)
Effect of exchange rate changes on cash | 9 | (52) | (51)
Total Increase (decrease) in cash and cash equivalents | 48 | (260) | (119)
Cash and cash equivalents, beginning | 1,257 | 1,517 |
Cash and cash equivalents, ending | 1,305 | 1,257 | 1,517
SUPPLEMENTAL DISCLOSURES: |  |  |
Cash payments for interest, net of amounts capitalized | (1,273) | (1,265) | (1,351)
Cash payments for income taxes, net of refunds | (487) | (388) | (480)
Parent Company |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 818 | 475 | 449
Investing Activities: |  |  |
Expenses related to asset sales | 0 | 0 | (4)
Investment in and net advances to subsidiaries | (650) | (221) | (69)
Return of capital | 247 | 501 | 740
Decrease in restricted cash | 29 | 49 | 96
Additions to property, plant and equipment | (12) | (11) | (31)
Purchase of short term investments, net | 0 | 0 | (1)
Net cash used in investing activities | (386) | 318 | 731
Financing Activities: |  |  |
Borrowings of notes payable and other coupon bearing securities | 500 | 575 | 1,525
Repayments of notes payable and other coupon bearing securities | (808) | (915) | (2,117)
Loans from subsidiaries | 183 | 0 | 263
Purchase of treasury stock | (79) | (482) | (308)
Proceeds from issuance of common stock | 1 | 4 | 1
Common stock dividends paid | (290) | (276) | (144)
Payments for deferred financing costs | (12) | (6) | (20)
Payments to Noncontrolling Interests | (2) | 0 | 0
Proceeds from (Payments for) Other Financing Activities | (3) | (18) | 0
Net cash (used in) provided by financing activities | (510) | (1,118) | (800)
Effect of exchange rate changes on cash | 1 | 0 | 0
Total Increase (decrease) in cash and cash equivalents | (77) | (325) | 380
Cash and cash equivalents, beginning | 186 | 511 | 131
Cash and cash equivalents, ending | 109 | 186 | 511
SUPPLEMENTAL DISCLOSURES: |  |  |
Cash payments for interest, net of amounts capitalized | 296 | 314 | 373
Cash payments for income taxes, net of refunds | $ 6 | $ 0 | $ (2)

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