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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, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Held-to-maturity, Fair Value $ 596 $ 679
Debt Securities, Held-to-maturity 603 696
Debt and other financing obligations, carrying value 61,473 56,756
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 61,449 56,823
Fair Value, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Held-to-maturity, Fair Value 596 679
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 524 577
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 72 102
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 59,851 53,626
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 59,851 53,626
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