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Debt (Senior Notes) (Narrative) (Details) - USD ($) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 11, 2021 | Mar. 31, 2021 | Jan. 29, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Debt instrument, principal amount |  | $ 12,134,000,000 |  | $ 11,180,000,000
2021 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, principal amount |  | $ 1,500,000,000 | $ 1,500,000,000 |
Debt instrument, maturity date |  | Feb. 01, 2029 |  |
Debt instrument, interest rate, stated percentage |  | 3.125% |  |
Interest payable dates |  | February 1 and August 1 |  |
Financing fees |  | $ 14,300,000 |  |
Redemption period |  | Feb. 01, 2024 |  |
Aggregate redemption price, percentage |  | 35.00% |  |
Redemption price, percentage |  | 103.125% |  |
2021 Senior Notes [Member] | Redemption, Period One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption period |  | Feb. 01, 2024 |  |
Redemption price, percentage |  | 101.563% |  |
2021 Senior Notes [Member] | Redemption, Period Two [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption period |  | Feb. 01, 2025 |  |
Redemption price, percentage |  | 100.781% |  |
2021 Senior Notes [Member] | Redemption, Period Three [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption period |  | Feb. 01, 2026 |  |
Redemption price, percentage |  | 100.00% |  |
2017 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of unsecured debt | $ 750,000,000.0 |  |  |
Write-off of deferred financing fees | 4,200,000 |  |  |
Debt instrument, principal amount |  |  |  | $ 750,000,000
Debt instrument, maturity date |  | Oct. 01, 2022 |  |
Debt instrument, interest rate, stated percentage |  | 4.00% |  |
Debt call premium | $ 7,500,000 |  |  |

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