Long-Term Debt - Schedule of Debt (Details) $ in Millions	Sep. 30, 2020 USD ($)
Debt Disclosure [Abstract]
Scheduled maturities of long-term debt for remainder of 2020	$ 16
Scheduled maturities of long-term debt in 2021	67
Scheduled maturities of long-term debt in 2022	67
Scheduled maturities of long-term debt in 2023	67
Scheduled maturities of long-term debt in 2024	5,036
Scheduled maturities of long-term debt thereafter	10,968
Total debt	16,221
Debt estimate interest payment, due remainder of 2020	200
Debt estimate interest payment, due 2021	850
Debt estimate interest payment, due 2022	820
Debt estimate interest payment, due 2023	790
Debt estimate interest payment, due 2024	790
Debt estimate interest payment, due thereafter	690
Debt estimate interest payment, due	4,140
Debt service obligation due remainder of 2020	216
Debt service obligation due 2021	917
Debt service obligation due 2022	887
Debt service obligation due 2023	857
Debt service obligation due 2024	5,826
Debt service obligation due thereafter	11,658
Debt service obligation	$ 20,361

Debt Estimate Interest Payment, Due

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Debt Estimate Interest Payment, Due Remainder of the Year

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Debt Estimate Interest Payment, Due Thereafter

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Debt Estimate Interest Payment, Due Year Five

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Debt Estimate Interest Payment, Due Year Four

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Debt Estimate Interest Payment, Due Year Three

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Debt Service Obligation, Maturities, Repayments of Principal, Due

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Debt Service Obligation, Maturities, Repayments of Principal, Due Thereafter

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Debt Service Obligation, Maturities, Repayments of Principal, Remainder of Fiscal Year

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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