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Fair Value (Financial Assets and Liabilities, Not Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Held-to-maturity, Fair Value | $ 646 | $ 647
Debt Securities, Held-to-maturity | 639 | 638
Debt and other financing obligations, carrying value | 45,108 | 42,280
Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Held-to-maturity, Fair Value | 646 | 647
Debt and other financing obligations | 46,315 | 51,254
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 | 463 | 466
Debt and other financing obligations | 0 | 0
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 | 110 | 108
Debt and other financing obligations | 46,315 | 51,254
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 | 73 | 73
Debt and other financing obligations | 0 | 0
Long-term debt and other financing obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt and other financing obligations, carrying value | $ 40,903 | $ 42,171

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