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Stockholders' Equity - Changes in Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | $ 1,109 | $ 1,426 | $ 1,180 | $ 1,413
Total comprehensive income (loss) | 66 | (21) | 142 | 122
Preferred stock dividends | 0 | (2) | 0 | (7)
Common stock dividends | (9) | (7) | (27) | (23)
Distributions to noncontrolling interests | (2) | (1) | (8) | (8)
Share conversion |  |  | 0 | 3
Common stock share repurchases | (119) | (68) | (245) | (181)
Derecognition of noncontrolling interests |  |  | (5) | 0
Stock compensation | 7 | 6 | 17 | 16
Stock withheld for employee taxes | (1) | 0 | (3) | (2)
Ending Balance | 1,051 | 1,333 | 1,051 | 1,333
Attributable to Parent [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 1,006 | 1,322 | 1,080 | 1,309
Total comprehensive income (loss) | $ 66 | (22) | $ 128 | 114
Preferred stock dividends |  | (2) |  | (7)
Common stock dividends | $ (9) | (7) | $ (27) | (23)
Share conversion |  |  |  | 3
Common stock share repurchases | (119) | (68) | $ (245) | (181)
Stock compensation | 7 | $ 6 | 17 | 16
Stock withheld for employee taxes | (1) |  | (3) | (2)
Ending Balance | 950 | $ 1,229 | 950 | 1,229
Attributable to Non-Controlling Interests [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 103 | 104 | 100 | 104
Total comprehensive income (loss) | 0 | 1 | 14 | 8
Distributions to noncontrolling interests | (2) | (1) | (8) | (8)
Derecognition of noncontrolling interests |  |  | (5) |
Ending Balance | $ 101 | $ 104 | $ 101 | $ 104

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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