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Schedule I - Condensed Financial Information of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 2,134 | $ 1,791 | $ 2,715
Investing Activities: |  |  |
Decrease in restricted cash | (159) | 419 | 44
(Purchase) sale of short term investments, net | (17) | (728) | (7)
Net cash used in investing activities | (2,366) | (656) | (1,774)
Financing Activities: |  |  |
Borrowings (payments) under the revolver, net | 959 | 836 | 1,139
Purchase of treasury stock | (482) | (308) | (322)
Common stock dividends paid | (276) | (144) | (119)
Payments for deferred financing costs | (90) | (158) | (176)
Proceeds from (Payments for) Other Financing Activities | (7) | 27 | 14
Net cash provided by (used in) financing activities | 28 | (1,262) | (1,136)
Effect of exchange rate changes on cash | (52) | (51) | (59)
Total decrease in cash and cash equivalents | (277) | (103) | (258)
Cash and cash equivalents, beginning | 1,539 | 1,642 | 1,900
Cash and cash equivalents, ending | 1,262 | 1,539 | 1,642
SUPPLEMENTAL DISCLOSURES: |  |  |
Cash payments for interest, net of amounts capitalized | 1,265 | 1,351 | 1,398
Cash payments for income taxes, net of refunds | 388 | 480 | 570
Parent Company |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 475 | 449 | 418
Investing Activities: |  |  |
Expenses related to asset sales | 0 | (4) | (5)
Investment in and net advances to subsidiaries | (221) | (69) | 201
Return of capital | 501 | 740 | 230
Decrease in restricted cash | 49 | 96 | 50
Additions to property, plant and equipment | (11) | (31) | (11)
(Purchase) sale of short term investments, net | 0 | (1) | 1
Net cash used in investing activities | 318 | 731 | 466
Financing Activities: |  |  |
Borrowings (payments) under the revolver, net | 0 | 0 | 0
Borrowings of notes payable and other coupon bearing securities | 575 | 1,525 | 750
Repayments of notes payable and other coupon bearing securities | (915) | (2,117) | (1,210)
Loans (to) from subsidiaries | 0 | 263 | (152)
Purchase of treasury stock | (482) | (308) | (322)
Proceeds from issuance of common stock | 4 | 1 | 13
Common stock dividends paid | (276) | (144) | (119)
Payments for deferred financing costs | (6) | (20) | (17)
Proceeds from (Payments for) Other Financing Activities | (18) | 0 | 0
Net cash provided by (used in) financing activities | (1,118) | (800) | (1,057)
Effect of exchange rate changes on cash | 0 | 0 | (1)
Total decrease in cash and cash equivalents | (325) | 380 | (174)
Cash and cash equivalents, beginning | 511 | 131 | 305
Cash and cash equivalents, ending | 186 | 511 | 131
SUPPLEMENTAL DISCLOSURES: |  |  |
Cash payments for interest, net of amounts capitalized | 314 | 373 | 442
Cash payments for income taxes, net of refunds | $ 0 | $ (2) | $ 11

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