EBP Plan Assets (Details 4) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Redemption notification period restrictions for commingled investment funds		15 days
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Redemption notification period restrictions for commingled investment funds		1 day
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		$ 1,117	$ 1,336	$ 1,357
Pension Benefits [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	104	175
Pension Benefits [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	306	399
Pension Benefits [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		$ 410	574
Pension Benefits [Member] | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset target allocation		75.00%
Pension Benefits [Member] | Cash management funds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	$ 45	37
Pension Benefits [Member] | Cash management funds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	0	0
Pension Benefits [Member] | Cash management funds | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		$ 45	37
Pension Benefits [Member] | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset target allocation		25.00%
Pension Benefits [Member] | Equity securities | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]		42
Pension Benefits [Member] | Equity securities | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]		19
Pension Benefits [Member] | Equity securities | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value			61
Pension Benefits [Member] | Government debt securities | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	$ 58	99
Pension Benefits [Member] | Government debt securities | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	18	28
Pension Benefits [Member] | Government debt securities | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		76	127
Pension Benefits [Member] | Corporate debt securities | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	0	0
Pension Benefits [Member] | Corporate debt securities | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	284	350
Pension Benefits [Member] | Corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		284	350
Pension Benefits [Member] | Mutual fund - Municipal bonds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]		0
Pension Benefits [Member] | Mutual fund - Municipal bonds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]		0
Pension Benefits [Member] | Mutual fund - Municipal bonds | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value			0
Pension Benefits [Member] | Other | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	1	(3)
Pension Benefits [Member] | Other | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	4	2
Pension Benefits [Member] | Other | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		5	(1)
Pension Benefits [Member] | Commingled investment funds - equities | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[3]	273	288
Pension Benefits [Member] | Commingled investment funds - fixed income | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[3]	434	474
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		253	287	$ 278
Other Postretirement Benefits [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	113	124
Other Postretirement Benefits [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	42	61
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		155	185
Other Postretirement Benefits [Member] | Cash management funds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	105	14
Other Postretirement Benefits [Member] | Cash management funds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	0	0
Other Postretirement Benefits [Member] | Cash management funds | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		105	14
Other Postretirement Benefits [Member] | Equity securities | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]		39
Other Postretirement Benefits [Member] | Equity securities | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]		10
Other Postretirement Benefits [Member] | Equity securities | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value			49
Other Postretirement Benefits [Member] | Government debt securities | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	8	13
Other Postretirement Benefits [Member] | Government debt securities | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	3	4
Other Postretirement Benefits [Member] | Government debt securities | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		11	17
Other Postretirement Benefits [Member] | Corporate debt securities | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	0	0
Other Postretirement Benefits [Member] | Corporate debt securities | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	39	47
Other Postretirement Benefits [Member] | Corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		39	47
Other Postretirement Benefits [Member] | Mutual fund - Municipal bonds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]		59
Other Postretirement Benefits [Member] | Mutual fund - Municipal bonds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]		0
Other Postretirement Benefits [Member] | Mutual fund - Municipal bonds | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value			59
Other Postretirement Benefits [Member] | Other | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[1]	0	(1)
Other Postretirement Benefits [Member] | Other | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[2]	0	0
Other Postretirement Benefits [Member] | Other | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		0	(1)
Other Postretirement Benefits [Member] | Commingled investment funds - equities | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[3]	38	39
Other Postretirement Benefits [Member] | Commingled investment funds - fixed income | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	[3]	$ 60	$ 63

[1] Level 1 includes assets with fair values based on quoted prices in active markets for identical assets. Cash management funds, equity securities traded on U.S. exchanges, U.S. Treasury securities, and mutual funds are included in this level.

[2] Level 2 includes assets with fair values determined by using significant other observable inputs. This level includes equity securities traded on active foreign exchanges and fixed income securities, other than U.S. Treasury securities, that are valued primarily using pricing models which incorporate observable inputs such as benchmark yields, reported trades, broker/dealer quotes, and issuer spreads.

[3] The commingled investment funds are measured at fair value using net asset value per share. Certain standard withdrawal restrictions generally apply, which may include redemption notification period restrictions ranging from 1 day to 15 days.