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Debt (Unsecured Credit Facilities Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2013 | Feb. 28, 2017 | Mar. 31, 2014 | Dec. 31, 2016 | Oct. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Oct. 31, 2014 | Sep. 30, 2014
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity |  |  |  | $ 34,699,715,000 |  |  |  |  |  |  |
Undrawn amount, available for drawdown under the facility |  |  |  | $ 7,338,181,000 |  |  |  |  |  |  |
Asia Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, current borrowing capacity |  |  |  |  | $ 600,000,000 | $ 585,000,000 | $ 575,000,000 |  |  |  |
Credit facility, term |  |  |  | 5 years |  |  |  |  |  |  |
Asia Revolving Credit Facility [Member] | Revolving Period [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, term |  |  |  | 3 years |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 1.95% |  |  |  |  |  |  |
Asia Revolving Credit Facility [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, term |  |  |  | 2 years |  |  |  |  |  |  |
Asia Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of balance to be repaid on specific dates |  |  |  | 33.00% |  |  |  |  |  |  |
Asia Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of balance to be repaid on specific dates |  |  |  | 67.00% |  |  |  |  |  |  |
Asia Revolving Credit Facility [Member] | Interest Rate During First Year [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 2.25% |  |  |  |  |  |  |
Asia Revolving Credit Facility [Member] | Interest Rate During Second Year [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 2.50% |  |  |  |  |  |  |
Citi Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, current borrowing capacity |  |  | $ 2,750,000,000 |  |  |  |  |  | $ 3,000,000,000 | $ 2,955,000,000 | $ 2,925,000,000
Credit facility, term |  |  | 4 years |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 2.00% |  |  |  |  |  |  |
Unused loan commitment fee, percentage |  |  |  | 0.375% |  |  |  |  |  |  |
Citi Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing capacity |  |  | $ 4,000,000,000 |  |  |  |  |  |  |  |
AIG Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, current borrowing capacity |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
Credit facility maximum borrowing capacity | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Credit facility, term | 5 years |  |  |  |  |  |  |  |  |  |
Maturity date of facility |  |  |  | May 01, 2019 |  |  |  |  |  |  |
AIG Revolving Credit Facility [Member] | Interest Rate Option 1 [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 3.75% |  |  |  |  |  |  |
AIG Revolving Credit Facility [Member] | Interest Rate Option 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.75% |  |  |  |  |  |  |
AIG Revolving Credit Facility [Member] | Interest Rate Option 2(x) [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 0.50% |  |  |  |  |  |  |
AIG Revolving Credit Facility [Member] | Interest Rate Option 2(z) [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 1.00% |  |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity |  |  |  | $ 18,469,864,000 |  |  |  |  |  |  |
Undrawn amount, available for drawdown under the facility |  |  |  | 4,100,000,000 |  |  |  |  |  |  |
Asia Revolving Credit Facility [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity |  |  |  | 600,000,000 |  |  |  |  |  |  |
Undrawn amount, available for drawdown under the facility |  |  |  | 600,000,000 |  |  |  |  |  |  |
Citi Revolving Credit Facility [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity |  |  |  | 3,000,000,000 |  |  |  |  |  |  |
Undrawn amount, available for drawdown under the facility |  |  |  | $ 3,000,000,000 |  |  |  |  |  |  |
Subsequent Event [Member] | Citi Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, current borrowing capacity |  | $ 3,745,000,000 |  |  |  |  |  |  |  |  |
Maturity date of facility |  | Feb. 01, 2021 |  |  |  |  |  |  |  |  |
Spread over reference rate |  | 1.50% |  |  |  |  |  |  |  |  |
Unused loan commitment fee, percentage |  | 0.25% |  |  |  |  |  |  |  |  |

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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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