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Fair Value (Financial Assets and Liabilities, Not Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Held-to-maturity, Fair Value | $ 508 | $ 596
Debt Securities, Held-to-maturity | 512 | 603
Debt and other financing obligations, carrying value | 76,180 | 61,473
Long-term debt and other financing obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and other financing obligations, carrying value | 75,604 | 61,449
Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Held-to-maturity, Fair Value | 508 | 596
Fair Value, Nonrecurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Held-to-maturity, Fair Value | 482 | 524
Fair Value, Nonrecurring [Member] | Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Held-to-maturity, Fair Value | 26 | 72
Fair Value, Nonrecurring [Member] | Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Long-term debt and other financing obligations [Member] | Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and other financing obligations | 70,565 | 59,851
Long-term debt and other financing obligations [Member] | Fair Value, Nonrecurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and other financing obligations | 0 | 0
Long-term debt and other financing obligations [Member] | Fair Value, Nonrecurring [Member] | Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and other financing obligations | 70,565 | 59,851
Long-term debt and other financing obligations [Member] | Fair Value, Nonrecurring [Member] | Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and other financing obligations | $ 0 | $ 0

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