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Debt - Credit Facilities - Schedule (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Total debt principal | $ 6,177,000,000 | $ 6,759,000,000
Line of Credit | Senior credit facilities |  |
Debt Instrument [Line Items] |  |
Total debt principal | 5,662,000,000 |
Line of Credit | $400 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 400,000,000 |
Total debt principal | 138,000,000 |
Book value of collateral vessels | $ 142,000,000 |
Line of Credit | $400 million facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.50% |
Line of Credit | $2,000 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 2,000,000,000 |
Total debt principal | 912,000,000 |
Book value of collateral vessels | $ 548,000,000 |
Line of Credit | $2,000 million facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.00% |
Line of Credit | $440 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 440,000,000 |
Total debt principal | 66,000,000 |
Book value of collateral vessels | $ 54,000,000 |
Line of Credit | $440 million facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 4.25% |
Line of Credit | $1,450 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 1,450,000,000 |
Total debt principal | 329,000,000 |
Book value of collateral vessels | $ 79,000,000 |
Line of Credit | $1,450 million facility | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.35% |
Line of Credit | $1,450 million facility | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 4.00% |
Line of Credit | $360 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 360,000,000 |
Total debt principal | 117,000,000 |
Book value of collateral vessels | $ 183,000,000 |
Line of Credit | $360 million facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.75% |
Line of Credit | $300 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 300,000,000 |
Total debt principal | 147,000,000 |
Book value of collateral vessels | $ 97,000,000 |
Line of Credit | $300 million facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 4.00% |
Line of Credit | $1,750 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 1,750,000,000 |
Total debt principal | 894,000,000 |
Book value of collateral vessels | $ 8,000,000 |
Line of Credit | $1,750 million facility | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.50% |
Line of Credit | $1,750 million facility | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.90% |
Line of Credit | $450 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 450,000,000 |
Total debt principal | 270,000,000 |
Book value of collateral vessels | $ 0 |
Line of Credit | $450 million facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.50% |
Line of Credit | $1,500 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 1,500,000,000 |
Total debt principal | 1,146,000,000 |
Book value of collateral vessels | $ 206,000,000 |
Line of Credit | $1,500 million facility | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.70% |
Line of Credit | $1,500 million facility | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 4.78% |
Line of Credit | $1,350 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 1,350,000,000 |
Total debt principal | 961,000,000 |
Book value of collateral vessels | $ 55,000,000 |
Line of Credit | $1,350 million facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.00% |
Line of Credit | $950 million facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 950,000,000 |
Total debt principal | 577,000,000 |
Book value of collateral vessels | $ 51,000,000 |
Line of Credit | $950 million facility | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.00% |
Line of Credit | $950 million facility | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 4.42% |
Line of Credit | $450 million facility (2015) |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 450,000,000 |
Total debt principal | 105,000,000 |
Book value of collateral vessels | $ 82,000,000 |
Line of Credit | $450 million facility (2015) | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.85% |
Line of Credit | ACE Facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | $ 359,000,000 |
Line of Credit | ACE Facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 5.50% |
Line of Credit | ACE Facility | $400 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | $ 17,000,000 |
Line of Credit | ACE Facility | $2,000 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 80,000,000 |
Line of Credit | ACE Facility | $440 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 6,000,000 |
Line of Credit | ACE Facility | $1,450 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 13,000,000 |
Line of Credit | ACE Facility | $360 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 18,000,000 |
Line of Credit | ACE Facility | $300 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 6,000,000 |
Line of Credit | ACE Facility | $1,750 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 70,000,000 |
Line of Credit | ACE Facility | $450 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 24,000,000 |
Line of Credit | ACE Facility | $1,500 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 40,000,000 |
Line of Credit | ACE Facility | $1,350 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 38,000,000 |
Line of Credit | ACE Facility | $950 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 38,000,000 |
Line of Credit | ACE Facility | $450 million facility (2015) |  |
Debt Instrument [Line Items] |  |
Total debt principal | 9,000,000 |
Line of Credit | Main Facility | $400 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 121,000,000 |
Line of Credit | Main Facility | $2,000 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 832,000,000 |
Line of Credit | Main Facility | $440 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 60,000,000 |
Line of Credit | Main Facility | $1,450 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 316,000,000 |
Line of Credit | Main Facility | $360 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 99,000,000 |
Line of Credit | Main Facility | $300 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 141,000,000 |
Line of Credit | Main Facility | $1,750 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 824,000,000 |
Line of Credit | Main Facility | $450 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 246,000,000 |
Line of Credit | Main Facility | $1,500 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 1,106,000,000 |
Line of Credit | Main Facility | $1,350 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 923,000,000 |
Line of Credit | Main Facility | $950 million facility |  |
Debt Instrument [Line Items] |  |
Total debt principal | 539,000,000 |
Line of Credit | Main Facility | $450 million facility (2015) |  |
Debt Instrument [Line Items] |  |
Total debt principal | $ 96,000,000 |

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