Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2019

Defined Benefit Plan [Abstract]

Reconciliation Of The Benefit Obligation

The reconciliation of the benefit obligation is as follows:

	Pension Benefits						Other Benefits
	2019			2018			2019			2018
Benefit obligation at beginning of year	$	1,743		$	1,872		$	431		$	524
Service cost	—			8			1			1
Interest cost	62			55			15			15
Actuarial loss (gain)	200			(70		)	5			(57		)
Benefits paid	(125		)	(122		)	(29		)	(52		)
Benefit obligation at end of year	$	1,880		$	1,743		$	423		$	431

Changes In The Fair Value Of Plan Assets

The changes in the fair value of plan assets are as follows:

	Pension Benefits						Other Benefits
	2019			2018			2019			2018
Fair value of plan assets at beginning of year	$	1,818		$	2,012		$	336		$	356
Actual return on plan assets	329			(76		)	55			(17		)
Employer contributions	4			4			5			49
Benefits paid	(125		)	(122		)	(29		)	(52		)
Fair value of plan assets at end of year	$	2,026		$	1,818		$	367		$	336

Net Amount Included In Consolidated Balance Sheets

The net amount included in the consolidated balance sheets is as follows:

	Pension Benefits						Other Benefits
	2019			2018			2019			2018
Noncurrent assets	$	212		$	134		$	—		$	—
Current liabilities	(6		)	(6		)	—			—
Noncurrent liabilities	(60		)	(53		)	(56		)	(95		)
Net amount at December 31	$	146		$	75		$	(56	)	$	(95	)

Net Amounts Included In Accumulated Other Comprehensive Loss (Income) That Have Not Been Recognized As Components Of Net Periodic Benefit Costs

The net amounts included in accumulated other comprehensive loss that have not been recognized as components of net periodic benefit costs are as follows:

	Pension Benefits				Other Benefits
	2019		2018		2019			2018
Net actuarial loss	$	734	$	751	$	25		$	58
Prior service cost (credit)	1		1		(19		)	(34		)
Net amount before tax at December 31	$	735	$	752	$	6		$	24

Schedule Of Assumptions Used In Calculating The Benefit Obligations

The weighted-average assumptions used in calculating the benefit obligations for all plans are as follows: 

	Pension Benefits				Other Benefits
	2019		2018		2019		2018
Discount rate	3.11	%	4.15	%	2.93	%	4.04	%
Rate of compensation increase	3.00	%	3.00	%	3.00	%	3.00	%
Expected rate of return on plan assets	7.33	%	7.44	%	7.00	%	7.00	%

Components Of Net Periodic Benefit Cost (Credit)

The components of net periodic benefit credit included in the consolidated statements of income are as follows:

	2019			2018			2017
Pension Benefits
Service cost	$	—		$	8		$	10
Interest cost	62			55			66
Expected return on assets	(138		)	(147		)	(147		)
Recognized actuarial loss	17			22			22
Settlement loss	9			5			7
Net periodic benefit credit	$	(50	)	$	(57	)	$	(42	)
Other Benefits
Service cost	$	1		$	1		$	1
Interest cost	15			15			21
Expected return on assets	(22		)	(24		)	(23		)
Recognized actuarial loss	2			3			11
Amortization of prior service credit	(12		)	(12		)	(13		)
Net periodic benefit credit	$	(16	)	$	(17	)	$	(3	)

Weighted-Average Assumptions Used In Calculating The Benefit Obligations For All Plans

The weighted-average assumptions used in calculating the net periodic benefit cost for all plans are as follows:

	2019		2018		2017
Pension Benefits
Discount rate	4.15	%	3.44	%	3.77	%
Rate of compensation increase	3.00	%	3.00	%	3.00	%
Expected rate of return on plan assets	7.44	%	7.83	%	7.95	%
Other Benefits
Discount rate	4.04	%	3.42	%	3.82	%
Rate of compensation increase	3.00	%	3.00	%	3.00	%
Expected rate of return on plan assets	7.00	%	7.00	%	7.00	%

Fair Values of Pension Benefit Assets and Other Benefit Assets by Asset Category and Level Inputs

 The fair values of our pension benefit assets and other benefit assets by asset category and level inputs at December 31, 2019, excluding cash, investment income receivable and amounts due to/from brokers, resulting in a net asset of $64, are as follows (see Note 6, “Fair Value,” for additional information regarding the definition of level inputs):

	Level I		Level II		Level III		Total
December 31, 2019
Pension Benefit Assets:
Equity securities:
U.S. securities	$	626	$	—	$	—	$	626
Foreign securities	197		—		—		197
Mutual funds	38		—		—		38
Fixed maturity securities:
Government securities	—		252		—		252
Corporate securities	—		339		—		339
Asset-backed securities	—		163		—		163
Other types of investments:
Alternative investments	—		136		52		188
Insurance company contracts	—		—		175		175
Total pension benefit assets	$	861	$	890	$	227	$	1,978
Other Benefit Assets:
Equity securities:
U.S. securities	$	8	$	—	$	—	$	8
Foreign securities	2		—		—		2
Mutual funds	25		—		—		25
Fixed maturity securities:
Government securities	—		2		—		2
Corporate securities	—		4		—		4
Asset-backed securities	—		3		—		3
Other types of investments:
Alternative investments	—		1		—		1
Life insurance contracts	—		—		294		294
Investment in DOL 103-12 trust	—		12		—		12
Total other benefit assets	$	35	$	22	$	294	$	351

The fair values of our pension benefit assets and other benefit assets by asset category and level inputs at December 31, 2018, excluding cash, investment income receivable and amounts due to/from brokers, resulting in a net asset of $69, are as follows:

	Level I		Level II		Level III		Total
December 31, 2018
Pension Benefit Assets:
Equity securities:
U.S. securities	$	488	$	—	$	—	$	488
Foreign securities	147		—		—		147
Mutual funds	36		—		—		36
Fixed maturity securities:
Government securities	—		248		—		248
Corporate securities	—		347		—		347
Asset-backed securities	—		153		—		153
Other types of investments:
Alternative investments	—		—		187		187
Insurance company contracts	—		—		166		166
Total pension benefit assets	$	671	$	748	$	353	$	1,772
Other Benefit Assets:
Equity securities:
U.S. securities	$	9	$	—	$	—	$	9
Foreign securities	3		—		—		3
Mutual funds	27		—		—		27
Fixed maturity securities:
Government securities	—		3		—		3
Corporate securities	—		5		—		5
Asset-backed securities	—		5		—		5
Other types of investments:
Alternative investments	—		—		2		2
Life insurance contracts	—		—		249		249
Investment in DOL 103-12 trust	—		10		—		10
Total other benefit assets	$	39	$	23	$	251	$	313

Reconciliation Of The Beginning And Ending Balances Of Plan Assets Measured At Fair Value Using Level III Inputs

A reconciliation of the beginning and ending balances of plan assets measured at fair value using Level III inputs for the years ended December 31, 2019, 2018 and 2017 is as follows:

	Alternative Investments			Insurance Company Contracts			Life Insurance Contracts			Total
Year ended December 31, 2019
Beginning balance at January 1, 2019	$	189		$	166		$	249		$	604
Actual return on plan assets relating to assets still held at the reporting date	28			12			45			85
Purchases	24			6			—			30
Sales	(52		)	(9		)	—			(61		)
Transfers out of Level III	(137		)	—			—			(137		)
Ending balance at December 31, 2019	$	52		$	175		$	294		$	521
Year ended December 31, 2018
Beginning balance at January 1, 2018	$	221		$	173		$	269		$	663
Actual return on plan assets relating to assets still held at the reporting date	(10		)	(7		)	(15		)	(32		)
Purchases	—			8			—			8
Sales	(22		)	(8		)	(5		)	(35		)
Ending balance at December 31, 2018	$	189		$	166		$	249		$	604
Year ended December 31, 2017
Beginning balance at January 1, 2017	$	114		$	173		$	238		$	525
Actual return on plan assets relating to assets still held at the reporting date	20			(1		)	31			50
Purchases	126			10			—			136
Sales	(39		)	(9		)	—			(48		)
Ending balance at December 31, 2017	$	221		$	173		$	269		$	663

Estimated Future Payments For Pension Benefits And Postretirement Benefits

Our estimated future payments for pension benefits and postretirement benefits, which reflect expected future service, as appropriate, are as follows:

	Pension Benefits		Other Benefits
2020	$	126	$	37
2021	126		36
2022	127		35
2023	124		34
2024	120		33
2025 - 2029	567		140