Debt - Schedule of Annual Estimated Debt Service Requirements (Details) $ in Millions	Mar. 31, 2020 USD ($)
Annual maturities of long-term debt
Total	$ 9,785
Annual maturities of long-term debt
Annual maturities of long-term debt
Remaining 2020	864
2021	49
2022	359
2023	49
2024	6,721
Thereafter	1,743
Total	9,785
Estimated interest payments
Annual maturities of long-term debt
Remaining 2020	380
2021	440
2022	410
2023	350
2024	340
Thereafter	100
Total	2,020
Total debt service obligation
Annual maturities of long-term debt
Remaining 2020	1,244
2021	489
2022	769
2023	399
2024	7,061
Thereafter	1,843
Total	$ 11,805

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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