Earnings Per Share (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Corporate Unit, Notional Value | $	$ 1,043
Preferred stock (without par value, 50,000,000 shares authorized; 1,043,050 issued and outstanding at December 31, 2021) | $	$ 825	$ 0
Preferred Stock, Convertible, Initial Conversion Rate | $ / shares	$ 31.5428
Preferred Stock, Convertible, Conversion Price | $ / shares	$ 31.70
Equity Unit, Shares Issued	10,430,500
Corporate Equity Unit, Stated Value Per Share | $ / shares	$ 100
Preferred Stock, Beneficial Ownership Interest in One Share	0.10
Share-based Payment Arrangement
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	5,000,000
Weighted Average Number Antidilutive Securities Excluded from Computation of EPS	4,000,000
Equity Unit Purchase Agreements
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	40,000,000
Weighted Average Number Antidilutive Securities Excluded from Computation of EPS	33,000,000