Long-term Debt - PAC - Maturity Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
2022	$ 1,265
2023	3,225
2024	2,736
2025	2,540
2026	1,474
2027 and thereafter	38,506
Total	49,746
Total long-term debt	49,762	$ 49,866
PAC
Debt Instrument [Line Items]
Total long-term debt	8,730	$ 8,612
PAC \| Long-term Debt
Debt Instrument [Line Items]
2022	155
2023	449
2024	591
2025	302
2026	100
2027 and thereafter	7,200
Total	8,797
Unamortized discount and debt issuance costs	(67)
Total long-term debt	$ 8,730

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