Employee Benefit Plans - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) plan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer matching contribution per dollar	$ 1.00
Defined contribution plan, employer matching contribution	5.00%
Defined contribution plan, employers matching contribution for vesting plan	4.00%
Defined contribution plan, employers matching contribution for vesting, period	3 years
Defined contribution plans, cost	$ 194,000,000	$ 236,000,000
Number of non-qualified defined contribution plans | plan	2
Defined contribution plan, assets and liabilities	$ 322,000,000	314,000,000
Pension plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension assets or obligations, threshold, per plan	20,000,000
Fair values of the plan assets	3,147,000,000	3,202,000,000	$ 3,004,000,000
Employer contributions	28,000,000	20,000,000
Defined Benefit Plan, Benefit Obligation	3,550,000,000	3,806,000,000	$ 3,451,000,000
Pension plan | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated future employer contributions in next fiscal year	30,000,000
Pension plan | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated future employer contributions in next fiscal year	35,000,000
Pension plan | Fixed income and cash investment funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair values of the plan assets	1,890,000,000	1,807,000,000
Pension plan | Fair value measured at Net Asset Value per share
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair values of the plan assets	$ 3,028,000,000	$ 3,072,000,000
Pension plan | Fair value measured at Net Asset Value per share | Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of plan assets valued using NAV	16.00%	21.00%
Pension plan | Fair value measured at Net Asset Value per share | Fixed income and cash investment funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of plan assets valued using NAV	62.00%	59.00%
Pension plan | Fair value measured at Net Asset Value per share | Alternative investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of plan assets valued using NAV	22.00%	20.00%
Pension plan | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair values of the plan assets	$ 119,000,000	$ 130,000,000
Pension plan | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair values of the plan assets	$ 112,000,000	120,000,000
Pension plan | U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of retirement plans | plan	4
Pension plan | Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of retirement plans | plan	7
Postretirement Health Coverage | U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	$ 50,000,000	62,000,000
Supplemental Employee Retirement Plan | U.S. | U.S. Non-Qualified Supplemental Pension Plan | Nonqualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Trust Assets	$ 45,000,000	$ 44,000,000