Derivative and Financial Instruments (Foreign Currency Exchange - Net Exposures from Outstanding Derivative Contracts) (Details) - Nondesignated [Member] £ in Millions, $ in Millions, $ in Millions	Dec. 31, 2021 AUD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2021 GBP (£)	Dec. 31, 2020 AUD ($)	Dec. 31, 2020 CAD ($)	Dec. 31, 2020 GBP (£)
Buy British Pound Sell Euro [Member]
Notional Disclosures [Abstract]
Net notional position of foreign currency exchange derivatives \| £			£ 155			£ 0
Sell British Pound, Buy Euro [Member]
Notional Disclosures [Abstract]
Net notional position of foreign currency exchange derivatives \| £			£ 0			£ 5
Sell Canadian dollar, buy U.S. dollar [Member]
Notional Disclosures [Abstract]
Net notional position of foreign currency exchange derivatives		$ 0			$ 370
Foreign Exchange Forward [Member]
Notional Disclosures [Abstract]
Net notional position of foreign currency exchange derivatives	$ 1,900				450
Buy Canadian Dollar, Sell US Dollar [Member]
Notional Disclosures [Abstract]
Net notional position of foreign currency exchange derivatives		$ 77			$ 0
Buy Australian Dollar, Sell US Dollar [Member]
Notional Disclosures [Abstract]
Net notional position of foreign currency exchange derivatives	$ 1,850			$ 0