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Equity Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended | 78 Months Ended
--- | --- | --- | --- | ---
Dec. 09, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  |  |  | $ 0.11 |  |  | $ 0.11 |  | $ 0.11 |  |
Dividends declared on common stock (per share amount) | $ 0.12 | $ 0.23 | $ 0.11 | $ 0.00 | $ 0.11 | $ 0.21 | $ 0.10 | $ 0.10 | $ 0.00 | $ 0.45 | $ 0.41 | $ 0.25 |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  |  | $ 79 | $ 482 | $ 308 |
Acquisition of treasury stock (shares) |  |  |  |  |  |  |  |  |  | 8,700,000 |  |  | 154,300,000
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.12
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 246 |  |  |  |  |  |  |  | $ 246 |  |  | $ 246
Treasury stock, shares (in shares) |  | 156,878,891 |  |  |  | 149,037,831 |  |  |  | 156,878,891 | 149,037,831 |  | 156,878,891

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + 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 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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