Taxation (Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Examination [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 440	$ 950	$ 527
Income (Loss) from Continuing Operations before Income Taxes, Foreign	4,809	3,707	3,195
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	5,249	4,657	3,722
Current tax expense	908	652	359
Deferred tax expense	(113)	43	(498)
Provision for income taxes	795	695	(139)
Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Current tax expense	29	89	46
Deferred tax expense	11	3	2
Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Current tax expense	879	563	313
Deferred tax expense	$ (124)	$ 40	$ (500)