Other Assets, Net (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Computer Software Amortization Expense	$ 73	$ 75	$ 71
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	154
Finite-Lived Intangible Assets, Amortization Expense, Year Two	118
Finite-Lived Intangible Assets, Amortization Expense, Year Three	80
Finite-Lived Intangible Assets, Amortization Expense, Year Four	45
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 27
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	15 years
Other Intangible Assets [Member]
Intangible assets amortization expense	$ 112	$ 119	$ 129