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Stockholders' Equity (Details 2) - USD ($) shares in Millions, $ in Millions	3 Months Ended		12 Months Ended	33 Months Ended
	Sep. 30, 2021	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Feb. 13, 2019
Equity [Abstract]
Stock Repurchase Program, Authorized Amount					$ 1,000
Stock Repurchased and Retired During Period, Shares	1.1	2.6	7.6	11.3
Stock Repurchased and Retired During Period, Value	$ 50	$ 100	$ 337	$ 487

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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