Debt - Future Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Long-term Debt, Fiscal Year Maturity
2020	$ 2,060
2021	1,094
2022	1,708
2023	932
2024	1,508
Thereafter	2,689
Total	9,991	$ 9,308
Amortization of Debt Premium and Debt Issuance Cost, net and other
2020	13
2021	15
2022	16
2023	11
2024	10
Thereafter	50
Total	115	60
Long-term debt	$ 10,106	$ 9,368

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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