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Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 3,374	$ 3,688	$ 3,361
Interest cost		97	110	$ 129
Actuarial (gain) loss		(183)	436
Settlement		(173)	(166)
Benefits paid		(55)	(53)
Projected benefit obligation at end of year (a)		3,374	3,688	3,361
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	3,457	3,462	3,198
Actual return on plan assets		219	480
Employer contributions		4	3
Settlement		(173)	(166)
Benefits paid		(55)	(53)
Fair value of plan assets at end of year (b)		3,457	3,462	3,198
Accumulated benefit obligation at end of year (a)		3,374	3,688
Funded status		83	(226)
Noncurrent asset		114	1
Current liability		(4)	(5)
Long-term liability		(27)	(222)
Net amounts recognized in consolidated balance sheet		83	(226)
Expected return on plan assets		165	156	164
Remeasurement gain (loss)		237	(112)	(104)
Net periodic pension benefit (cost)		$ 305	$ (66)	$ (69)
Discount rate assumption used to calculate benefit obligation (percentage)		3.01%	2.70%
Expected long-term rate of return on plan assets		5.00%	5.00%	5.75%
Discount rate		2.70%	3.48%	4.37%
Total fair value of investment plan assets		$ 2,710	$ 2,886
Accrued investment income and other receivables		247	19
Fair value of plan assets		3,457	3,462	$ 3,198
Pension plan expected future benefit payments, 2022		227
Pension plan expected future benefit payments, 2023		217
Pension plan expected future benefit payments, 2024		206
Pension plan expected future benefit payments, 2025		196
Pension plan expected future benefit payments, 2026		188
Pension plan expected future benefit payments, thereafter		843
Multiemployer Plan, Employer Contribution, Cost		3	7	9
Withdrawal liability from multiemployer pension plan		94	98
Level 1
Change in Fair Value of Plan Assets [Roll Forward]
Total fair value of investment plan assets		2	4
Level 2
Change in Fair Value of Plan Assets [Roll Forward]
Total fair value of investment plan assets		2,708	2,882
Fair Value Measured at Net Asset Value Per Share
Change in Fair Value of Plan Assets [Roll Forward]
Total fair value of investment plan assets		$ 546	$ 557
Return-seeking securities
Change in Fair Value of Plan Assets [Roll Forward]
Target Allocation		60.00%	60.00%
Actual Allocation		57.30%	57.10%
Liability-matching securities
Change in Fair Value of Plan Assets [Roll Forward]
Target Allocation		40.00%	40.00%
Actual Allocation		42.60%	42.80%
Other investments
Change in Fair Value of Plan Assets [Roll Forward]
Target Allocation		0.00%	0.00%
Actual Allocation		0.10%	0.10%
Cash
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		$ 2	$ 4
Cash | Level 1
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		2	4
Cash | Level 2
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		0	0
Commingled bond funds(a)
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		1,398	1,449
Commingled bond funds(a) | Level 1
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		0	0
Commingled bond funds(a) | Level 2
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		1,398	1,449
Commingled equity funds(a)
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		1,160	1,255
Commingled equity funds(a) | Level 1
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		0	0
Commingled equity funds(a) | Level 2
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		1,160	1,255
Collective trust funds(b)
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		150	178
Collective trust funds(b) | Level 1
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		0	0
Collective trust funds(b) | Level 2
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		150	178
Alternative funds(a) | Fair Value Measured at Net Asset Value Per Share
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		328	283
Fixed income funds(b) | Fair Value Measured at Net Asset Value Per Share
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		95	148
Real estate funds(c) | Fair Value Measured at Net Asset Value Per Share
Change in Fair Value of Plan Assets [Roll Forward]
Pension plan investment assets		123	126
Qualified Plan
Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	3,300	3,700
Projected benefit obligation at end of year (a)		3,300	3,700
Change in Fair Value of Plan Assets [Roll Forward]
Accumulated benefit obligation at end of year (a)		3,300	3,700
Nonqualified Plan
Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 32	36
Projected benefit obligation at end of year (a)		32	36
Change in Fair Value of Plan Assets [Roll Forward]
Accumulated benefit obligation at end of year (a)		$ 32	36
Subsequent Event
Change in Fair Value of Plan Assets [Roll Forward]
Expected long-term rate of return on plan assets	5.00%
Discount rate	3.01%
401(k) Plan
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee (percentage)		50.00%
Defined contribution plan, employer matching contribution (percentage)		100.00%
Defined contribution plan, employer matching contribution percent of employees' gross pay (percentage)		6.00%
Defined contribution plan, employer's contributions		$ 328	331	303
Retirement Accumulation Plan
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution percent of employees' gross pay (percentage)		3.00%
Defined contribution plan, employer's contributions		$ 167	$ 162	$ 152

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Investment income accrued on pension investment assets that have not been allocated to the various investment categories.

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