Policy Claims and Benefits (Claims Development) (Details) - Life Insurance Product Line [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	[1]	Dec. 31, 2019	[1]	Dec. 31, 2018	[1]	Dec. 31, 2017	[1]	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]	Dec. 31, 2014	[1]	Dec. 31, 2013	[1]	Dec. 31, 2012	[1]
Claims Development [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	$ 1,379
Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	1,876
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented	75
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	2,432
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	631
Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	3,768
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented	110
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	4,406
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	748
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	307	$ 301		$ 293		$ 283		$ 268		$ 251		$ 230		$ 191		$ 139		$ 51
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	328	325		323		319		313		303		295		292		287		214
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	3
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	279	275		272		268		264		258		252		244		222		109
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	297	296		297		297		298		299		298		297		309		$ 323
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	0
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	320	313		304		292		269		243		216		149		51
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	340	339		340		338		324		310		313		323		302
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	4
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	309	305		302		297		292		286		277		249		114
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	336	335		337		336		336		337		339		333		$ 349
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	0
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	267	260		250		236		212		183		140		36
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	294	295		295		293		279		273		309		285
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	5
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	374	368		364		356		349		337		305		129
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	401	399		399		396		397		396		411		$ 408
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	0
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	251	241		229		208		172		122		50
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	275	276		275		275		258		265		287
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	8
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	441	437		431		422		407		361		146
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	463	463		462		462		465		461		$ 460
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	0
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	183	172		157		137		101		39
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	223	226		227		219		212		235
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	7
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	467	460		451		437		393		185
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	498	497		497		501		500		$ 501
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	0
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	157	141		119		90		37
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	211	224		221		221		219
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	7
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	468	462		448		403		190
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	503	504		509		514		$ 485
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	0
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	182	151		110		33
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	261	273		279		261
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	22
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	479	465		415		183
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	517	524		538		$ 538
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	1
Short-Duration Insurance Contract, Accident Year 2019 [Member] | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	145	105		39
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	277	270		261
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	44
Short-Duration Insurance Contract, Accident Year 2019 [Member] | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	418	372		180
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	456	473		$ 491
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	4
Short-Duration Insurance Contract, Accident Year 2020 | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	56	23
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	151	154
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	40
Short-Duration Insurance Contract, Accident Year 2020 | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	356	159
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	426	$ 469
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	25
Short-Duration Insurance Contract, Accident Year 2021 | Asia Pacific [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	8
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	72
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	37
Short-Duration Insurance Contract, Accident Year 2021 | Americas [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	177
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	509
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 211

[1] 2012 – 2020 unaudited.