Debt (Maturity of debt) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
2022	$ 0
2023	243
2024	550
2025	0
2026	500
Thereafter	1,500
Less: discount	(14)
Total	$ 2,779	$ 2,776

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Amount, after accumulated amortization, of debt discount.

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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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