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Derivatives - Interest-Rate Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |  |
Debt referenced to LIBOR | $ 38,494 | $ 38,494 | $ 38,588
LIBOR |  |  |
Derivative [Line Items] |  |  |
Debt referenced to LIBOR | 1,500 | 1,500 |
Interest Rate Swap, 6.835% |  |  |
Derivative [Line Items] |  |  |
Notional Principal Amount | $ 400 | $ 400 |
Weighted-Average Interest Rate | 6.348% | 6.348% |
Interest Rate Swap, 6.891% |  |  |
Derivative [Line Items] |  |  |
Notional Principal Amount | $ 350 | $ 350 |
Weighted-Average Interest Rate | 6.662% | 6.662% |
Interest Rate Swap, 6.570% |  |  |
Derivative [Line Items] |  |  |
Notional Principal Amount | $ 275 | $ 275 |
Weighted-Average Interest Rate | 6.709% | 6.709% |
Interest Rate Swap, 6.445% |  |  |
Derivative [Line Items] |  |  |
Notional Principal Amount | $ 450 | $ 450 |
Weighted-Average Interest Rate | 6.445% | 6.445% |
Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Net cash receipts (payments) related to settlements | $ 3 | $ (47) |
Collateral paid with respect to interest rate swap agreements | $ 221 | $ 320 |

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