Preferred and Common Stock - Narrative (Details)		1 Months Ended			3 Months Ended			12 Months Ended
	Sep. 28, 2021	Jan. 31, 2022 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Jul. 30, 2015 tranche	Dec. 31, 2021 USD ($) $ / shares shares	Sep. 30, 2021 $ / shares	Mar. 31, 2019 $ / shares	Dec. 31, 2021 USD ($) class $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Feb. 01, 2022 USD ($)	Oct. 15, 2019 USD ($)	Dec. 01, 2015 USD ($)
Preferred Stock
Preferred stock, number of classes | class								2
Common Stock
Common stock, shares authorized (in shares) | shares					600,000,000			600,000,000
Common stock issued (in shares) | shares					421,691,912			421,691,912
Common stock outstanding (in shares) | shares					421,691,912			421,691,912	433,000,000
Common stock, dividends declared per share (usd per share) | $ / shares								$ 0.04	$ 0.02	$ 0.12
Dividends paid per share (usd per share) | $ / shares					$ 0.02	$ 0.02	$ 0.06			$ 0.02
Number of shares available for issuance (in shares) | shares					47,000,000			47,000,000
Common stock reserved for future issuance (in shares) | shares					31,000,000			31,000,000
Stock repurchased during period								$ 430,000,000	$ 73,000,000	$ 1,150,000,000
Stock repurchase program, remaining repurchase amount					$ 1,347,000,000			$ 1,347,000,000
Average shares outstanding - diluted (in shares) | shares								435,000,000	439,000,000	463,000,000
Stock-based Compensation
Cash payments for performance awards								$ 23,000,000
Stock based compensation expense (benefit), before tax			$ 12,000,000					40,000,000	$ 46,000,000	$ 69,000,000
Stock based compensation expense, after tax								36,000,000	42,000,000	63,000,000
Share-based payment arrangement included in cash bonus award									$ 2,000,000	$ 21,000,000
Unrecognized compensation costs on non-vested stock option grants (pretax)					68,000,000			$ 68,000,000
Unrecognized compensation costs on non-vested awards, weighted average period of recognition in years								1 year 9 months 18 days
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value (in usd per share) | $ / shares									$ 2.57
Average risk-free interest rate. percentage								0.20%	0.30%	1.60%
Number of options, outstanding weighted average remaining contractual life								2 years 7 months 6 days
Total intrinsic value of options outstanding					$ 15,000,000			$ 15,000,000
Proceeds from exercise of employee stock options								22,000,000	$ 33,000,000	$ 56,000,000
Total tax benefit realized from these exercises								2,000,000	3,000,000	4,000,000
Total intrinsic value of options exercised								10,000,000	14,000,000	17,000,000
Total intrinsic value of options exercised converted								55,000,000	104,000,000	48,000,000
Restructuring and Other Charges
Stock-based Compensation
Stock based compensation expense (benefit), before tax								$ (2,000,000)		(3,000,000)
Subsequent Event
Common Stock
Stock repurchased during period		$ 100,000,000
Stock repurchase program, remaining repurchase amount											$ 1,247,000,000
Number of shares (in shares) | shares		3,000,000
Average price per share (in usd per share) | $ / shares		$ 33.81
Average shares outstanding - diluted (in shares) | shares		425,000,000
Stock options
Stock-based Compensation
Stock options granted, vesting period								3 years
Share-based compensation arrangement by share-based payment award, expiration period								10 years
Stock options granted, contractual term								6 months
Restricted Stock Units (RSUs)
Stock-based Compensation
Stock options granted, contractual term								3 years
Stock based compensation expense (benefit), before tax								$ 0	$ 0	$ 0
Percentage of remaining share based compensation expenses									95.00%
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value (in usd per share) | $ / shares								$ 43.41	$ 21.33	$ 11.93
Volatility, percentage								56.00%	48.30%	33.40%
Share-based Compensation Award, Tranche One | Stock options
Stock-based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage								33.33%
Share-based Compensation Award, Tranche Two | Stock options
Stock-based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage								33.33%
Share-based Compensation Award, Tranche Three | Stock options
Stock-based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage								33.33%
Convertible Debt
Common Stock
Number of repayment tranches | tranche				2
Convertible Debt | Tranche Due December 2015
Common Stock
Aggregate principal amount													$ 115,000,000
Convertible Debt | Tranche Due October 2019
Common Stock
Aggregate principal amount												$ 403,000,000
Revolving Credit Agreement
Common Stock
Debt instrument, term	5 years
Preferred Class A
Preferred Stock
Preferred stock dividend declared (usd per share) | $ / shares								$ 3.75	$ 3.75	$ 3.75
Number of shares of preferred stock authorized (in shares) | shares					660,000			660,000
Preferred stock par value (usd per share) | $ / shares					$ 100			$ 100
Preferred stock, shares outstanding (in shares) | shares					546,024			546,024
Preferred Class B
Preferred Stock
Number of shares of preferred stock authorized (in shares) | shares					10,000,000			10,000,000
Preferred stock par value (usd per share) | $ / shares					$ 1			$ 1
Preferred stock, shares outstanding (in shares) | shares					0			0	0