Shareholders' Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period	$ (2,509)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(2,487)	$ (2,509)
Treasury Stock, Value	2,700	1,700
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	204	(609)
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	(153)	328
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period	(2,622)	(2,248)
Net realized gains (losses)	0	0
Other Comprehensive Income (Loss), Tax	32	(93)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	83	(374)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(2,539)	(2,622)
Deferred Gain (Loss) On Hedging Activities [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	337	268
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period	148	225
Net realized gains (losses)	(322)	(352)
Other Comprehensive Income (Loss), Tax	(5)	7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	10	(77)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	158	148
Pension Liability Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(46)	117
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period	(22)	(147)
Net realized gains (losses)	(42)	23
Other Comprehensive Income (Loss), Tax	2	(15)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(86)	125
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(108)	(22)
Unrealized Gain (Loss) On Investments [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	16	(12)
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period	(13)	(2)
Net realized gains (losses)	0	0
Other Comprehensive Income (Loss), Tax	(1)	1
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	15	(11)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	2	(13)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	511	(236)
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	(153)	328
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period	(2,509)	(2,172)
Net realized gains (losses)	(364)	(329)
Other Comprehensive Income (Loss), Tax	28	(100)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	22	(337)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	$ (2,487)	$ (2,509)