Equity, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax
Beginning balance, accumulated other comprehensive loss, net of tax	$ 18,801
Other comprehensive income (loss) before reclassifications	177	$ 69	$ 147
Amounts reclassified from accumulated other comprehensive  loss	67	28	9
Other comprehensive income (loss)	246	97	156
Effect of exchange rates	2
Ending balance, accumulated other comprehensive loss, net of tax	18,430	18,801
Accumulated Other Comprehensive Loss [Member]
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax
Beginning balance, accumulated other comprehensive loss, net of tax	(1,254)	(1,351)	(1,507)
Ending balance, accumulated other comprehensive loss, net of tax	(1,008)	(1,254)	(1,351)
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax
Beginning balance, accumulated other comprehensive loss, net of tax	(515)	(676)	(1,022)
Other comprehensive income (loss) before reclassifications	(47)	161	346
Amounts reclassified from accumulated other comprehensive  loss	0	0	0
Other comprehensive income (loss)	(47)	161	346
Effect of exchange rates	0
Ending balance, accumulated other comprehensive loss, net of tax	(562)	(515)	(676)
Defined Benefit Plans Items [Member]
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax
Beginning balance, accumulated other comprehensive loss, net of tax	(737)	(672)	(485)
Other comprehensive income (loss) before reclassifications	245	(106)	(197)
Amounts reclassified from accumulated other comprehensive  loss	49	41	10
Other comprehensive income (loss)	296	(65)	(187)
Effect of exchange rates	2
Ending balance, accumulated other comprehensive loss, net of tax	(441)	(737)	(672)
Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax
Beginning balance, accumulated other comprehensive loss, net of tax	(2)	(3)	0
Other comprehensive income (loss) before reclassifications	(21)	14	(2)
Amounts reclassified from accumulated other comprehensive  loss	18	(13)	(1)
Other comprehensive income (loss)	(3)	1	(3)
Effect of exchange rates	0
Ending balance, accumulated other comprehensive loss, net of tax	$ (5)	$ (2)	$ (3)