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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