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Parent Company (Interest Paid and Income Tax Refunds (Payments)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Interest paid	$ 2,172	$ 582	$ 1,292
Income Tax Refunds/ (Payments)	26	73	10
Parent Company
Condensed Financial Statements, Captions [Line Items]
Interest paid	314	307	335
Income Tax Refunds/ (Payments)	$ (255)	$ 386	$ 29

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3367-108585

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The amount of cash received during the period as refunds for the overpayment of taxes.

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-Topic 230
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