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Debt and Credit Agreements - Schedule of Senior Unsecured Notes Issued (Details) - Senior Notes - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2010 | Jul. 31, 2008 | Oct. 07, 2021 | Oct. 01, 2021
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  |  |  | $ 1,800,000,000 | $ 2,000,000,000
6.51% weighted-average private placement senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  |  | $ 425,000,000 |  |
6.51% weighted-average private placement senior notes | Tranche 1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  |  | $ 245,000,000 |  |
Term |  |  | 10 years |  |
Coupon |  |  | 6.44% |  |
6.51% weighted-average private placement senior notes | Tranche 2 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  |  | $ 100,000,000 |  |
Term |  |  | 12 years |  |
Coupon |  |  | 6.54% |  |
6.51% weighted-average private placement senior notes | Tranche 3 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  |  | $ 80,000,000 |  |
Term |  |  | 15 years |  |
Coupon |  |  | 6.69% |  |
5.58% weighted-average private placement senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  | $ 175,000,000 |  |  |
5.58% weighted-average private placement senior notes | Tranche 1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  | $ 88,000,000 |  |  |
Term |  | 10 years |  |  |
Coupon |  | 5.42% |  |  |
5.58% weighted-average private placement senior notes | Tranche 2 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  | $ 25,000,000 |  |  |
Term |  | 12 years |  |  |
Coupon |  | 5.59% |  |  |
5.58% weighted-average private placement senior notes | Tranche 3 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) |  | $ 62,000,000 |  |  |
Term |  | 15 years |  |  |
Coupon |  | 5.80% |  |  |
3.65% weighted-average private placement senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) | $ 925,000,000 |  |  |  |
3.65% weighted-average private placement senior notes | Tranche 1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) | $ 100,000,000 |  |  |  |
Term | 7 years |  |  |  |
Coupon | 3.24% |  |  |  |
3.65% weighted-average private placement senior notes | Tranche 2 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) | $ 575,000,000 |  |  |  |
Term | 10 years |  |  |  |
Coupon | 3.67% |  |  |  |
3.65% weighted-average private placement senior notes | Tranche 3 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal (In millions) | $ 250,000,000 |  |  |  |
Term | 12 years |  |  |  |
Coupon | 3.77% |  |  |  |

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