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Debt - Credit Facilities - Narrative (Details) - USD ($) | 1 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Line of Credit Facility [Line Items] |  |  |  |  |
Additional interest rate, default | 2.00% |  | 2.00% | 2.00% |
Total debt principal | $ 6,177,000,000 |  | $ 6,177,000,000 | $ 6,177,000,000 | $ 6,759,000,000
Line of Credit | ACE Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total debt principal | 359,000,000 |  | 359,000,000 | $ 359,000,000 |
Line of Credit | ACE Facility | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 5.50% |
Senior credit facilities | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Scheduled payments defaulted on | 54,000,000 | $ 54,000,000 | 108,000,000 |  |
Amount of scheduled amortization payments that may be deferred and converted | 500,000,000 |  | 500,000,000 | $ 500,000,000 |
Amount of scheduled amortization payments elected to defer | 489,000,000 |  | 489,000,000 | 489,000,000 |
Total debt principal | 5,662,000,000 |  | 5,662,000,000 | 5,662,000,000 |
Amount of scheduled amortization payments elected to defer for payments due in 2021 | 130,000,000 |  | 130,000,000 | 130,000,000 |
$450 million facility (2015) | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total debt principal | 105,000,000 |  | 105,000,000 | 105,000,000 |
Maximum borrowing capacity | 450,000,000 |  | 450,000,000 | $ 450,000,000 |
$450 million facility (2015) | Line of Credit | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 3.85% |
$450 million facility (2015) | Line of Credit | ACE Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total debt principal | 9,000,000 |  | 9,000,000 | $ 9,000,000 |
$360 million facility | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total debt principal | 117,000,000 |  | 117,000,000 | 117,000,000 |
Repayments of lines of credit |  |  |  | 96,000,000 |
Maximum borrowing capacity | 360,000,000 |  | 360,000,000 | $ 360,000,000 |
$360 million facility | Line of Credit | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 3.75% |
$360 million facility | Line of Credit | ACE Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total debt principal | 18,000,000 |  | 18,000,000 | $ 18,000,000 |
$2,000 million facility | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total debt principal | 912,000,000 |  | 912,000,000 | 912,000,000 |
Repayments of lines of credit |  | $ 12,000,000 |  |  |
Maximum borrowing capacity | 2,000,000,000 |  | 2,000,000,000 | $ 2,000,000,000 |
$2,000 million facility | Line of Credit | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 3.00% |
$2,000 million facility | Line of Credit | ACE Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total debt principal | $ 80,000,000 |  | $ 80,000,000 | $ 80,000,000 |

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