Shareholders' Equity And Net Income Per Share Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Dividends Payable [Line Items]
Payments of Cash Dividends	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 56	$ 0	$ 56
Common Stock, Dividends, Per Share, Cash Paid	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0.22	$ 0	$ 0.22
Mandatory Convertible Preferred Share cumulative dividends									$ 63	$ 35
Preferred Shares
Dividends Payable [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid	$ 1.375	$ 1.375	$ 1.375	$ 1.375	$ 1.375	$ 1.421	$ 0	$ 0	$ 5.500	$ 2.796
Mandatory Convertible Preferred Share cumulative dividends	$ 16	$ 15	$ 16	$ 16	$ 16	$ 16	$ 0	$ 0	$ 63	$ 32

Aggregate dividends paid during the period for each share of common stock outstanding.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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