Debt - Future Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Total Debt
2021	$ 1,480
2022	1,882
2023	4,016
2024	3,126
2025	5,157
Thereafter	12,553
Total	28,214	$ 9,991
Amortization of Debt (Discount)/Premium and Debt Issuance Cost, net and other
2021	(62)
2022	(63)
2023	(54)
2024	(46)
2025	(23)
Thereafter	8
Total	(240)	115
Total debt	$ 27,974	$ 10,106

Amortization of Debt Discount and Debt Issue Cost, net [Abstract]

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Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Year One

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Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Year Three

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Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Year Two

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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.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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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 requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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