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Preferred and Common Stock - Additional Information (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Jun. 29, 2018 | Sep. 16, 2016 | Jul. 25, 2014 | Jun. 30, 2020 USD ($) | Mar. 31, 2020 | Jul. 30, 2015 Tranche | Mar. 31, 2019 $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) class_of_stock $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares | Nov. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Nov. 30, 2019 USD ($) | Oct. 15, 2019 USD ($) | Aug. 06, 2019 USD ($) | May 14, 2019 USD ($) | May 02, 2019 USD ($) | Feb. 19, 2019 USD ($) | Dec. 01, 2015 USD ($)
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, number of classes | class_of_stock |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 432,906,377 |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 432,906,377 | 433,000,000 |  |  |  |  |  |  |  |  |  |
Common stock, dividends declared per share (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.02 | $ 0.12 | $ 0.24 |  |  |  |  |  |  |  |  |
Dividends paid per share (usd per share) | $ / shares |  |  |  |  |  |  | $ 0.06 | $ 0.06 |  |  | $ 0.02 |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) | shares |  |  |  |  |  |  |  |  |  | 47,000,000 |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) | shares |  |  |  |  |  |  |  |  |  | 33,000,000 |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period |  |  |  |  |  |  |  |  |  | $ 73,000,000 | $ 1,150,000,000 |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense (benefit), before tax |  |  |  | $ 12,000,000 |  |  |  |  |  | 46,000,000 | 69,000,000 | $ 40,000,000 |  |  |  |  |  |  |  |  |
Stock based compensation expense, after tax |  |  |  |  |  |  |  |  |  | 42,000,000 | 63,000,000 | $ 31,000,000 |  |  |  |  |  |  |  |  |
Share-based payment arrangement included in cash bonus award |  |  |  |  |  |  |  |  |  | 2,000,000 | 21,000,000 |  |  |  |  |  |  |  |  |  |
Stock based compensation expense, stock awards percentage |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |
Stock-based compensation expense capitalized |  |  |  |  |  |  |  | $ 0 |  | 0 | 0 | $ 0 |  |  |  |  |  |  |  |  |
Unrecognized compensation costs on non-vested stock option grants (pretax) |  |  |  |  |  |  |  |  |  | $ 51,000,000 |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 9.79 |  |  |  |  |  |  |  |  |
Average risk-free interest rate. percentage |  |  |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |
Number of options, outstanding weighted average remaining contractual life |  |  |  |  |  |  |  |  |  | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options outstanding |  |  |  |  |  |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |  |  |  |
Stock options vested (in shares) | shares |  |  |  |  |  |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life, vested and exercisable |  |  |  |  |  |  |  |  |  | 2 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, vested and exercisable (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 24.32 |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options vested and exercisable |  |  |  |  |  |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of employee stock options |  |  |  |  |  |  |  |  |  | 33,000,000 | 56,000,000 | $ 16,000,000 |  |  |  |  |  |  |  |  |
Total tax benefit realized from these exercises |  |  |  |  |  |  |  |  |  | 3,000,000 | 4,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  |  |  |  |  |  |  | $ 14,000,000 | 17,000,000 | $ 7,000,000 |  |  |  |  |  |  |  |  |
Restructuring and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense (benefit), before tax |  |  |  |  |  |  |  |  |  |  | $ (3,000,000) |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Average risk-free interest rate. percentage |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |
Volatility, percentage |  |  |  |  |  |  |  |  |  | 34.00% |  |  |  |  |  |  |  |  |  |  |
Dividend yield, percentage |  |  |  |  |  |  |  |  |  | 0.90% |  |  |  |  |  |  |  |  |  |  |
Annual pre- and post-vesting forfeitures, percentage |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |
Exercise behavior, percentage |  |  |  |  |  |  |  |  |  | 61.00% |  |  |  |  |  |  |  |  |  |  |
Life (years) |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted, contractual term |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Percentage of remaining share based compensation expenses |  |  |  |  |  |  |  |  |  | 95.00% | 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 |  |  |  |  |  |  |  |  |  | $ 21.33 | $ 11.93 | $ 20.25 |  |  |  |  |  |  |  |  |
Average risk-free interest rate. percentage |  |  |  |  |  |  |  |  |  |  | 1.60% | 2.70% |  |  |  |  |  |  |  |  |
Volatility, percentage |  |  |  |  |  |  |  |  |  | 48.30% | 33.40% | 32.00% |  |  |  |  |  |  |  |  |
Preferred Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of preferred stock authorized (in shares) | shares |  |  |  |  |  |  |  |  |  | 660,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock par value (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend declared (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 3.75 | $ 3.75 | $ 3.75 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Preferred stock par value (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date | 5 years | 5 years | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
February 2019 ASR total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |
May 2019 ASR total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 | $ 200,000,000 |  |
August 2019 ASR total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |
November 2019 open market repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
August/September 2020 open market repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,000,000 |  |  |  |  |  |  |
November 2020 open market repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,000,000 |  |  |  |  |  |  |  |
2020 Share repurchase total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, remaining repurchase amount |  |  |  |  |  |  |  |  |  | $ 277,000,000 |  |  |  |  |  |  |  |  |  |  |
Scenario, forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments for performance awards |  |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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