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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, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Held-to-maturity, Fair Value $ 589 $ 596
Debt Securities, Held-to-maturity 597 603
Fair Value, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Held-to-maturity, Fair Value 589 596
Debt and other financing obligations 63,489 59,851
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 522 524
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 67 72
Debt and other financing obligations 63,489 59,851
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
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 $ 66,299 $ 61,449