Business And Summary Of Significant Accounting Policies (Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at beginning of year	$ (3,068)	$ (2,791)	$ (2,145)
Increase (decrease)	2,223	(474)	(678)
Income tax impact	82	34	9
Other comprehensive income (loss), before reclassifications, net of income taxes	2,305	(440)	(669)
Increase (decrease)	407	172	30
Income tax impact	(12)	(9)	(7)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	395	163	23
Total other comprehensive income (loss), net of income taxes	2,700	(277)	(646)
Balance at end of year	(368)	(3,068)	(2,791)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at beginning of year	(2,173)	(2,098)	(1,466)
Increase (decrease)	2,893	(178)	(632)
Income tax impact	25	(6)	0
Other comprehensive income (loss), before reclassifications, net of income taxes	2,918	(184)	(632)
Increase (decrease)	0	109	0
Income tax impact	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0	109	0
Total other comprehensive income (loss), net of income taxes	2,918	(75)	(632)
Balance at end of year	745	(2,173)	(2,098)
Pension and postretirement plan benefit adjustments
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at beginning of year	(781)	(691)	(678)
Increase (decrease)	(239)	(149)	(45)
Income tax impact	57	32	9
Other comprehensive income (loss), before reclassifications, net of income taxes	(182)	(117)	(36)
Increase (decrease)	46	36	30
Income tax impact	(11)	(9)	(7)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	35	27	23
Total other comprehensive income (loss), net of income taxes	(147)	(90)	(13)
Balance at end of year	(928)	(781)	(691)
Unrealized gain (loss) on available-for-sale securities
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at beginning of year	(1)	(2)	(1)
Increase (decrease)	1	2	(1)
Income tax impact	0	(1)	0
Other comprehensive income (loss), before reclassifications, net of income taxes	1	1	(1)
Increase (decrease)	0	0	0
Income tax impact	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0	0	0
Total other comprehensive income (loss), net of income taxes	1	1	(1)
Balance at end of year	0	(1)	(2)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at beginning of year	(113)	0	0
Increase (decrease)	(432)	(149)	0
Income tax impact	0	9	0
Other comprehensive income (loss), before reclassifications, net of income taxes	(432)	(140)	0
Increase (decrease)	361	27	0
Income tax impact	(1)	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	360	27	0
Total other comprehensive income (loss), net of income taxes	(72)	(113)	0
Balance at end of year	$ (185)	$ (113)	$ 0