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Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2022	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Interest payable			$ 411	$ 429
Repayments of long-term debt	$ 1,100		1,105	6,542	$ 1,000
Loss on early extinguishment of debt		$ 649	$ 0	$ 649	$ 0
Gain (loss) on extinguishment of debt, before write off of debt issuance cost		(623)
Write off of deferred debt issuance cost		$ 26
Senior Notes [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Required purchase price as percentage of aggregate principal amount			101.00%
USD Denominated Notes [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate	2.85%
Repayments of unsecured debt	$ 1,100
USD Denominated Notes, 3.490 Percent, Due 2022 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate		3.49%
Repayments of long-term debt		$ 1,000