Income Taxes, Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Country	$ 283	$ (1,067)	$ 331
U.S. state / Canadian provincial	98	6	137
Total current	381	(1,061)	468
Deferred:
Country	(58)	179	262
U.S. state / Canadian provincial	(68)	(21)	(28)
Total deferred	(126)	158	234
Income tax expense (benefit)	255	(903)	702
U.S. [Member]
Current:
Country	68	(1,033)	145
U.S. state / Canadian provincial	1	9	37
Total current	69	(1,024)	182
Deferred:
Country	5	126	290
U.S. state / Canadian provincial	(24)	(51)	(16)
Total deferred	(19)	75	274
Income tax expense (benefit)	50	(949)	456
Foreign [Member]
Current:
Country	215	(34)	186
U.S. state / Canadian provincial	97	(3)	100
Total current	312	(37)	286
Deferred:
Country	(63)	53	(28)
U.S. state / Canadian provincial	(44)	30	(12)
Total deferred	(107)	83	(40)
Income tax expense (benefit)	$ 205	$ 46	$ 246