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Debt - Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
2022	$ 553
2023	603
2024	403
2025	555
2026 and subsequent years	9,988
Long-term debt	$ 12,102	$ 11,880

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Amount of long-term debt and lease obligation, classified as noncurrent.

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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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