Shareholders' Equity (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Repurchase Of Shares Of Common Stock [Line Items]
Stock Repurchased During Period, Shares	[1]	387,000	10,083,000	12,981,000
Stock Repurchased During Period, Value	[1]	$ 50	$ 1,200	$ 1,580
Value of share repurchases with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date.			$ 11	$ 11
Number of shares repurchased with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date.			100,000	100,000
Amortization of prior service cost	[2]	1	$ 5
Common Stock
Repurchase Of Shares Of Common Stock [Line Items]
Stock Repurchased During Period, Shares			10,000,000	13,000,000
Stock Repurchased During Period, Value		$ 24	$ 69	$ 31
May 2021
Repurchase Of Shares Of Common Stock [Line Items]
Stock Repurchased During Period, Shares		0	8,116,000	8,235,000
Stock Repurchased During Period, Value		$ 0	$ 950	$ 1,050
November 2019 [Member]
Repurchase Of Shares Of Common Stock [Line Items]
Stock Repurchased During Period, Shares		0	0	4,746,000
Stock Repurchased During Period, Value		$ 0	$ 0	$ 530
May 2021
Repurchase Of Shares Of Common Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount		1,700
September 2022
Repurchase Of Shares Of Common Stock [Line Items]
Stock Repurchased During Period, Value		50	$ 250
Stock Repurchase Program, Authorized Amount		$ 2,000
September 2022 | Common Stock
Repurchase Of Shares Of Common Stock [Line Items]
Stock Repurchased During Period, Shares		387,000	1,967,000	0

[1] 2021 amount excludes the effect of $11 million in share repurchases (0.1 million shares) with trade dates on, or prior to, December 31, 2020, but settlement dates subsequent to December 31, 2020.

[2] Amounts reclassified from AOCI for pension and post-retirement benefit plans losses during 2023 include amortization of prior service cost of $1 million. Amounts reclassified from AOCI for pension and post-retirement benefit plans losses during 2022 include amortization of net losses of $22 million, amortization of prior service cost of $5 million, settlement charges of $7 million and related income tax benefit of $6 million. See Note 15.