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Shareholders' Equity - Dividends (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividends paid on ordinary shares |  |  |  |  |  |  |  |  | $ 273 us-gaap_DividendsCommonStockCash | $ 212 us-gaap_DividendsCommonStockCash | $ 204 us-gaap_DividendsCommonStockCash
Dividends paid per share (in dollars per share) | $ 0.25 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.25 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.25 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.18 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.18 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.18 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.18 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.16 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.92 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.68 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.62 us-gaap_CommonStockDividendsPerShareCashPaid

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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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- Details
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