Employee Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Pre-tax AOCI not yet recognized as net pension cost		$ 381	$ 427
Accumulated benefit obligation for all pension plans		$ 1,200	$ 1,200
Percentage increase or decrease in expected return on plan assets		0.25%
Estimated increase or decrease in net pension cost		$ 2
Percentage increase or decrease in assumed discount rate		0.25%
Estimated change in net pension cost due to discount rate		$ 2
Expected return on plan assets (as a percent)		2.75%	3.75%	4.50%
Expected return on plan assets on estimating 2020 pension cost (as a percent)		2.75%
Employer contribution to saving plan		6.00%
Employer discretionary contribution, required service period		1 year
Employer discretionary contribution percentage		1.00%	1.00%	1.00%
Total expenses associated with saving plan		$ 105	$ 103	$ 98
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2022		90
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2023		89
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2024		87
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2025		85
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2026		82
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2027 through 2031		360
Accumulated benefit obligation for all pension plans		991	1,072
Net pension cost (benefit)		$ 24	$ 22	$ 29
Expected return on plan assets (as a percent)		2.75%	3.75%	4.50%
Discount rate		2.43%	2.05%
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Pre-tax AOCI not yet recognized as net pension cost		$ (23)	$ (25)
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2022		6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2023		6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2024		6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2025		6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2026		6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2027 through 2031		29
Net pension cost (benefit)		$ (2)	$ (1)	$ 0
Expected return on plan assets (as a percent)		4.50%	4.50%	4.50%
Age of employees under condition one		55 years
Period of service under condition one		5 years
Age of employees under condition two		50 years
Period of service under condition two		15 years
Minimum period of service at the time of termination hired before 2001		15 years
Discount rate		4.50%	4.50%
Forecast | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net pension cost (benefit)	$ 15
Minimum
Defined Benefit Plan Disclosure [Line Items]
Employees contribution to saving plan		1.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Employees contribution to saving plan		100.00%