Other Comprehensive Income (Loss) - Changes in AOCI Balance by Components (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Comprehensive Income (Loss):
(Loss) Income Before Reclassifications		$ 158	$ 53	$ (48)
Amounts Reclassified to Net Earnings		81	52	31
Tax Benefit (Expense)		(49)	(28)	3
Total Other Comprehensive Income (Loss) (Note 16)		190	77	(14)
Pension and Other Post-Employment Benefits
Other Comprehensive Income (Loss):
Beginning Balance		(598)	(619)	(604)
(Loss) Income Before Reclassifications		147	(17)	(43)
Amounts Reclassified to Net Earnings		66	47	23
Tax Benefit (Expense)		(46)	(9)	5
Total Other Comprehensive Income (Loss) (Note 16)		167	21	(15)
Ending Balance		(431)	(598)	(619)
Interest Rate Derivatives
Other Comprehensive Income (Loss):
Beginning Balance		62	0	0
(Loss) Income Before Reclassifications		11	80	0
Amounts Reclassified to Net Earnings		0	0	0
Tax Benefit (Expense)		(3)	(18)	0
Total Other Comprehensive Income (Loss) (Note 16)		8	62	0
Ending Balance		70	62	0
Other
Other Comprehensive Income (Loss):
Beginning Balance		(62)	(56)	(57)
(Loss) Income Before Reclassifications		0	(10)	(5)
Amounts Reclassified to Net Earnings		15	5	8
Tax Benefit (Expense)		0	(1)	(2)
Total Other Comprehensive Income (Loss) (Note 16)		15	(6)	1
Ending Balance		(47)	(62)	(56)
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss):
Beginning Balance		(598)	(675)	(661)
Total Other Comprehensive Income (Loss) (Note 16)	[1]	190	77	(14)
Ending Balance		$ (408)	$ (598)	$ (675)

[1] Accumulated Other Comprehensive Loss year-end balances shown above are net of tax. The associated taxes were $107 million, $156 million and $184 million for 2021, 2020 and 2019, respectively. For additional information see Note 16, Other Comprehensive Income.