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Debt (Revolving credit facilities) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2013 | Feb. 28, 2017 | Mar. 31, 2014 | Dec. 31, 2017 | Feb. 28, 2018 | Sep. 30, 2017 | Oct. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015
Asia Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing capacity |  |  |  |  |  |  | $ 600,000,000.0 | $ 575,000,000.0 |
Debt instrument term |  |  |  | 5 years |  |  |  |  |
Asia Revolving Credit Facility [Member] | Revolving Period [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  | 3 years |  |  |  |  |
Spread over reference rate |  |  |  | 1.95% |  |  |  |  |
Asia Revolving Credit Facility [Member] | Term Out Period [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  | 2 years |  |  |  |  |
Credit facility, percentage of balance to be repaid in December 2019 |  |  |  | 66.67% |  |  |  |  |
Credit facility, percentage of balance to be repaid in December 2020 |  |  |  | 33.33% |  |  |  |  |
Asia Revolving Credit Facility [Member] | Term Out Period [Member] | Interest Rate During First Year [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 2.25% |  |  |  |  |
Asia Revolving Credit Facility [Member] | Term Out Period [Member] | Interest Rate During Second Year [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 2.50% |  |  |  |  |
Citi Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing capacity |  | $ 3,750,000,000.00 | $ 2,750,000,000.00 |  |  | $ 3,895,000,000.000 |  |  |
Debt instrument term |  |  | 4 years |  |  |  |  |  |
Spread over reference rate |  | 1.50% | 2.00% |  |  |  |  |  |
Credit facility, maximum size of accordion feature |  |  | $ 4,000,000,000 |  |  |  |  |  |
Citi Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing capacity |  |  |  |  | $ 4,000,000,000.0 |  |  |  |
AIG Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing capacity | $ 1,000,000,000.0 |  |  | $ 200,000,000 |  |  |  |  | $ 500,000,000.0
Debt instrument term | 5 years |  |  |  |  |  |  |  |
AIG Revolving Credit Facility [Member] | Interest Rate Option1 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 3.75% |  |  |  |  |
AIG Revolving Credit Facility [Member] | Interest Rate Option2 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.75% |  |  |  |  |
AIG Revolving Credit Facility [Member] | Interest Rate Option2 X [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 0.50% |  |  |  |  |
AIG Revolving Credit Facility [Member] | Interest Rate Option2 Z [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 1.00% |  |  |  |  |

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- Definition Debt Instrument, Percentage of Balance To Be Repaid, Period One + References No definition available. + Details
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- Definition Debt Instrument, Percentage of Balance To Be Repaid, Period Two + References No definition available. + Details
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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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